+publisher:"University of Florida" +contributor:("BISWAS,AMLAN")

University of Florida

1. Zou, Jie. Detecting Classical and Quantum Fluctuations with Microelectromechanical Systems.

Degree: PhD, Physics, 2012, University of Florida

► Fluctuations are ubiquitous. It plays an important role in all physical and biological systems, including microelectromechanical systems (MEMS). Due to the relatively small size, MEMS… (more)

Subjects/Keywords: Electric potential; Electrodes; Electrostatics; Etching; Geometry; Microelectromechanical systems; Non Gaussianity; Oscillators; Signals; Silicon; casimir – fluctuations – mems – noise – on-chip

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APA (6^th Edition):

Zou, J. (2012). Detecting Classical and Quantum Fluctuations with Microelectromechanical Systems. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0044059

Chicago Manual of Style (16^th Edition):

Zou, Jie. “Detecting Classical and Quantum Fluctuations with Microelectromechanical Systems.” 2012. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0044059.

MLA Handbook (7^th Edition):

Zou, Jie. “Detecting Classical and Quantum Fluctuations with Microelectromechanical Systems.” 2012. Web. 18 Oct 2019.

Vancouver:

Zou J. Detecting Classical and Quantum Fluctuations with Microelectromechanical Systems. [Internet] [Doctoral dissertation]. University of Florida; 2012. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0044059.

Council of Science Editors:

Zou J. Detecting Classical and Quantum Fluctuations with Microelectromechanical Systems. [Doctoral Dissertation]. University of Florida; 2012. Available from: http://ufdc.ufl.edu/UFE0044059

University of Florida

2. Grant, Daniel M. Effect of Electric Field and Strain on the Magnetic Properties of Phase Separated Manganites.

Degree: PhD, Physics, 2015, University of Florida

URL: http://ufdc.ufl.edu/UFE0047728

► Perovskite manganese oxide "manganites" have attracted a large amount of research attention and show a wide variety of complex behaviors, including colossal responses to external… (more)

Subjects/Keywords: Anisotropy; Coercivity; Electric fields; Electric potential; Magnetic fields; Magnetism; Magnetization; Magnets; Photolithography; Thin films; coercive – dielectrophoresis – field – magnetism – manganite – microstructures – perovskite – phase – separation

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APA (6^th Edition):

Grant, D. M. (2015). Effect of Electric Field and Strain on the Magnetic Properties of Phase Separated Manganites. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0047728

Chicago Manual of Style (16^th Edition):

Grant, Daniel M. “Effect of Electric Field and Strain on the Magnetic Properties of Phase Separated Manganites.” 2015. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0047728.

MLA Handbook (7^th Edition):

Grant, Daniel M. “Effect of Electric Field and Strain on the Magnetic Properties of Phase Separated Manganites.” 2015. Web. 18 Oct 2019.

Vancouver:

Grant DM. Effect of Electric Field and Strain on the Magnetic Properties of Phase Separated Manganites. [Internet] [Doctoral dissertation]. University of Florida; 2015. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0047728.

Council of Science Editors:

Grant DM. Effect of Electric Field and Strain on the Magnetic Properties of Phase Separated Manganites. [Doctoral Dissertation]. University of Florida; 2015. Available from: http://ufdc.ufl.edu/UFE0047728

University of Florida

3. Ghosh, Siddhartha. Experimental Studies on Magnetic Nano Structures and Anti-Ferromagnetic Thin Films.

Degree: PhD, Physics, 2012, University of Florida

URL: http://ufdc.ufl.edu/UFE0044864

► Magnetic materials restricted in nano-scale gives rise to extremely fascinating behavior which is both important due to their potential applications as well as for their… (more)

Subjects/Keywords: Chromium; Conductivity; Electrons; Magnetic fields; Magnetism; Magnetization; Magnets; Superlattices; Temperature dependence; Thin films; physics

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APA (6^th Edition):

Ghosh, S. (2012). Experimental Studies on Magnetic Nano Structures and Anti-Ferromagnetic Thin Films. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0044864

Chicago Manual of Style (16^th Edition):

Ghosh, Siddhartha. “Experimental Studies on Magnetic Nano Structures and Anti-Ferromagnetic Thin Films.” 2012. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0044864.

MLA Handbook (7^th Edition):

Ghosh, Siddhartha. “Experimental Studies on Magnetic Nano Structures and Anti-Ferromagnetic Thin Films.” 2012. Web. 18 Oct 2019.

Vancouver:

Ghosh S. Experimental Studies on Magnetic Nano Structures and Anti-Ferromagnetic Thin Films. [Internet] [Doctoral dissertation]. University of Florida; 2012. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0044864.

Council of Science Editors:

Ghosh S. Experimental Studies on Magnetic Nano Structures and Anti-Ferromagnetic Thin Films. [Doctoral Dissertation]. University of Florida; 2012. Available from: http://ufdc.ufl.edu/UFE0044864

University of Florida

4. Moon, Byoung. Study on the Effects of Anisotropic Disorder on Superfluid Helium Three in High Porosity Aerogel Using Longitudinal Ultrasound.

Degree: PhD, Physics, 2010, University of Florida

URL: http://ufdc.ufl.edu/UFE0041531

► STUDY ON THE EFFECTS OF ANISOTROPIC DISORDER ON SUPERFLUID HELIUM THREE IN HIGH POROSITY AEROGEL USING LONGITUDINAL ULTRASOUND Longitudinal sound attenuation measurements in superfluid 3He… (more)

Subjects/Keywords: Acoustic attenuation; Aerogels; Audio frequencies; Impurities; Liquids; Magnetic fields; Phase diagrams; Temperature dependence; Transducers; Transition temperature; aerogel, attenuation, gapless, helium, longitudinal, phase, pvdf, superfluid, ultrasound

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APA (6^th Edition):

Moon, B. (2010). Study on the Effects of Anisotropic Disorder on Superfluid Helium Three in High Porosity Aerogel Using Longitudinal Ultrasound. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0041531

Chicago Manual of Style (16^th Edition):

Moon, Byoung. “Study on the Effects of Anisotropic Disorder on Superfluid Helium Three in High Porosity Aerogel Using Longitudinal Ultrasound.” 2010. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0041531.

MLA Handbook (7^th Edition):

Moon, Byoung. “Study on the Effects of Anisotropic Disorder on Superfluid Helium Three in High Porosity Aerogel Using Longitudinal Ultrasound.” 2010. Web. 18 Oct 2019.

Vancouver:

Moon B. Study on the Effects of Anisotropic Disorder on Superfluid Helium Three in High Porosity Aerogel Using Longitudinal Ultrasound. [Internet] [Doctoral dissertation]. University of Florida; 2010. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0041531.

Council of Science Editors:

Moon B. Study on the Effects of Anisotropic Disorder on Superfluid Helium Three in High Porosity Aerogel Using Longitudinal Ultrasound. [Doctoral Dissertation]. University of Florida; 2010. Available from: http://ufdc.ufl.edu/UFE0041531

University of Florida

5. Peprah, Marcus Kwasi. Influence of Pressure and Light on the Magnetic Properties of Prussian Blue Analogues and Hofmann-Like Frameworks.

Degree: PhD, Physics, 2015, University of Florida

URL: http://ufdc.ufl.edu/UFE0049032

► The magnetic properties of Prussian blue analogues (PBAs) have been studied as function of pressure, light, and temperature in single component and heterostructure morphologies using… (more)

Subjects/Keywords: Chemicals; Irradiation; Lead; Low temperature; Magnetic fields; Magnetism; Magnetization; Magnets; Squid; Transition temperature; hofmann-like-frameworks – magnetometry – molecularmagnetism – pressure – prussian-blue-analogues

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APA (6^th Edition):

Peprah, M. K. (2015). Influence of Pressure and Light on the Magnetic Properties of Prussian Blue Analogues and Hofmann-Like Frameworks. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0049032

Chicago Manual of Style (16^th Edition):

Peprah, Marcus Kwasi. “Influence of Pressure and Light on the Magnetic Properties of Prussian Blue Analogues and Hofmann-Like Frameworks.” 2015. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0049032.

MLA Handbook (7^th Edition):

Peprah, Marcus Kwasi. “Influence of Pressure and Light on the Magnetic Properties of Prussian Blue Analogues and Hofmann-Like Frameworks.” 2015. Web. 18 Oct 2019.

Vancouver:

Peprah MK. Influence of Pressure and Light on the Magnetic Properties of Prussian Blue Analogues and Hofmann-Like Frameworks. [Internet] [Doctoral dissertation]. University of Florida; 2015. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0049032.

Council of Science Editors:

Peprah MK. Influence of Pressure and Light on the Magnetic Properties of Prussian Blue Analogues and Hofmann-Like Frameworks. [Doctoral Dissertation]. University of Florida; 2015. Available from: http://ufdc.ufl.edu/UFE0049032

University of Florida

6. Lu, Zhichao. Physical Analysis and Design of Nanoscale Floating-Body Dram Cells.

Degree: PhD, Electrical and Computer Engineering, 2010, University of Florida

URL: http://ufdc.ufl.edu/UFE0042135

► This dissertation addresses physical analysis and design issues of nanoscale floating-body cells (FBC), which are also known as capacitorless dynamic random-access memory(DRAM) cells. A novel… (more)

▼ This dissertation addresses physical analysis and design issues of nanoscale floating-body cells (FBC), which are also known as capacitorless dynamic random-access memory(DRAM) cells. A novel two-transistor floating-body/gate cell (FBGC), and upgraded versions of it, are proposed and experimentally demonstrated. As the conventional one-transistor and one-capacitor (1T/1C) DRAM technology is aggressively scaled, novel device structures and materials have to be introduced to meet International Technology Roadmap for Semiconductors (ITRS) performance requirements. Novel device structures and materials bring a lot of processing and integration challenges to current complementary metal-oxide-semiconductor (CMOS) technology. To avoid these challenges, capacitorless DRAM, which is based on silicon-on-insulator (SOI) CMOS including partially depleted (PD) and fully depleted (FD) MOS transistors (MOSFETs), is attracting a lot of interest. This technology, which uses the floating body of the SOI MOSFET as the storage element, can potentially replace the conventional 1T/1C DRAM cell in the near future. The basic working principle of the FBC is to utilize the floating-body effect inherent in the PD/SOI MOSFET; the FD/SOI MOSFET also shows the floating-body effect when the substrate, or back gate is biased for accumulation. However, the physical explanation of the floating-body effect in the FD/SOI device is not clear. Based on numerical simulations, physical insights are gained on the effect and on FBC performance, e.g., the sense margin. Relying on the physical insights of the floating-body effects, a novel two-transistor(2T) FBC is proposed. By using the first transistor?s (T1) body to directly drive the second transistor?s gate, the 2T FBC eliminates the body-factor limitation on the sense margin. The memory performance is demonstrated with the University of Florida physics-based compact double-gate MOSFET model (UFDG). The predicted results show that the common impact ionization-based write method produces too much power dissipation. To resolve this problem, the 2T-FBC is refined to Ver. 1 of the floating-body/gate cell(FBGC1). The major feature of FBGC1 is the source tied source to the drain in T1. To improve the manufacturability of FBGC1, Ver. 2 (FBGC2) is proposed, which in essence is a gated diode (T1) plus a conventional transistor (T2). Gate-induced drain leakage (GIDL)current is used to write ?1? in FBGC2. The performance is demonstrated by 90nm FinFET technology and also by numerical simulation. One issue with FBGC2 is the short retention time with bit-line (BL) disturbs. Hence Ver. 3 (FBGC3) is proposed to the resolve this problem. Unlike FBGC2 which accumulates the channel to get GIDL charging current, FBGC3 inverts the channel and introduces tunneling current at the source side for charging, thereby separating the charging mechanisms for write and hold. By optimizing the device structure, FBGC3 demonstrates ~10s retention time with worst-case disturb. To make FBGC3 operate faster, Ver. 4 (FBGC4) is proposed. In… Advisors/Committee Members: Fossum, Jerry G. (committee chair), Guo, Jing (committee member), Fox, Robert M. (committee member), Biswas, Amlan (committee member).

Subjects/Keywords: Academic achievement; Capacitance; Cells; Drains; DRAM; Electric current; Electric potential; Signals; Simulations; Transistors; capacitorlessdram, doublegatefinfet, floatingbodycell, floatingbodyeffects, gidl, soimosfet

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lu, Z. (2010). Physical Analysis and Design of Nanoscale Floating-Body Dram Cells. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0042135

Chicago Manual of Style (16^th Edition):

Lu, Zhichao. “Physical Analysis and Design of Nanoscale Floating-Body Dram Cells.” 2010. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0042135.

MLA Handbook (7^th Edition):

Lu, Zhichao. “Physical Analysis and Design of Nanoscale Floating-Body Dram Cells.” 2010. Web. 18 Oct 2019.

Vancouver:

Lu Z. Physical Analysis and Design of Nanoscale Floating-Body Dram Cells. [Internet] [Doctoral dissertation]. University of Florida; 2010. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0042135.

Council of Science Editors:

Lu Z. Physical Analysis and Design of Nanoscale Floating-Body Dram Cells. [Doctoral Dissertation]. University of Florida; 2010. Available from: http://ufdc.ufl.edu/UFE0042135

University of Florida

7. Datta, Saiti. Studying the Effects of Interplay between Anisotropy and Exchange in Molecular Nanomagnets.

Degree: PhD, Physics, 2009, University of Florida

URL: http://ufdc.ufl.edu/UFE0024306

► This dissertation presents work on several molecular nanomagnets using both theoretical and experimental approaches to understand the effects of the interplay between anisotropy and exchange… (more)

▼ This dissertation presents work on several molecular nanomagnets using both theoretical and experimental approaches to understand the effects of the interplay between anisotropy and exchange in these systems. The molecular nanomagnets presented here can be classified into two different categories: single molecule magnets and antiferromagnetic wheels or grids. Magnetic anisotropy plays a significant role in these compounds and leads to bistability of the projections of the magnetic moment (`up' and `down') at lower temperatures, separated by a barrier. The employment of electron paramagnetic resonance techniques allows the understanding of some basic issues in quantum physics. Results presented for two iron complexes show the importance of easy-axis anisotropy in determining whether a molecule can be treated as a single molecule magnet. The importance of transverse anisotropy can be understood from the results obtained for a mixed valent manganese compound. One may consider a giant spin instead of treating the individual spins of the magnetic centers while interpreting these results using the spin Hamiltonian. For a tetranuclear cobalt complex, however, this is no longer a valid approximation and one needs to consider the generalized spin Hamiltonian to interpret the results. An attempt is made to compare anisotropies in ferromagnetic and antiferromagnetic manganese based triangular units. Results from several theoretical techniques like the projection operator and exact diagonalization methods are then supported with results from experiments. This allows an understanding of the combined role of anisotropy and exchange in determining the barrier in these molecular magnets. Finally, results for an antiferromagnetic grid and a wheel are presented to demonstrate how high-frequency/high-field electron paramagnetic resonance can be a useful technique to observe quantum spin dynamics in this class of molecular nanomagnets. ( en ) Advisors/Committee Members: Hill, Stephen O. (committee chair), Biswas, Amlan (committee member), Hirschfeld, Peter J. (committee member), Tanner, David B. (committee member), Christou, George (committee member).

Subjects/Keywords: Anisotropy; Fine structure; Ground state; Ions; Magnetic fields; Magnetism; Magnets; Molecules; Symmetry; Temperature dependence; anisotropy, electron, exchange, molecular

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Datta, S. (2009). Studying the Effects of Interplay between Anisotropy and Exchange in Molecular Nanomagnets. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0024306

Chicago Manual of Style (16^th Edition):

Datta, Saiti. “Studying the Effects of Interplay between Anisotropy and Exchange in Molecular Nanomagnets.” 2009. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0024306.

MLA Handbook (7^th Edition):

Datta, Saiti. “Studying the Effects of Interplay between Anisotropy and Exchange in Molecular Nanomagnets.” 2009. Web. 18 Oct 2019.

Vancouver:

Datta S. Studying the Effects of Interplay between Anisotropy and Exchange in Molecular Nanomagnets. [Internet] [Doctoral dissertation]. University of Florida; 2009. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0024306.

Council of Science Editors:

Datta S. Studying the Effects of Interplay between Anisotropy and Exchange in Molecular Nanomagnets. [Doctoral Dissertation]. University of Florida; 2009. Available from: http://ufdc.ufl.edu/UFE0024306

University of Florida

8. Das, Ritesh. Magnetism in nanoscale materials, effect of finite size and dipolar interactions.

Degree: PhD, Physics, 2010, University of Florida

URL: http://ufdc.ufl.edu/UFE0041972

► Material physics is always motivated by the materials with exotic properties. It was a common belief that exotic properties are only associated with exotic materials.… (more)

Subjects/Keywords: Anisotropy; Coercivity; Domain walls; Magnetic fields; Magnetism; Magnetization; Magnets; Nanoparticles; Particle interactions; Temperature dependence; dipolar, magnetism, nanomagnetics, nanomagnetism

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Das, R. (2010). Magnetism in nanoscale materials, effect of finite size and dipolar interactions. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0041972

Chicago Manual of Style (16^th Edition):

Das, Ritesh. “Magnetism in nanoscale materials, effect of finite size and dipolar interactions.” 2010. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0041972.

MLA Handbook (7^th Edition):

Das, Ritesh. “Magnetism in nanoscale materials, effect of finite size and dipolar interactions.” 2010. Web. 18 Oct 2019.

Vancouver:

Das R. Magnetism in nanoscale materials, effect of finite size and dipolar interactions. [Internet] [Doctoral dissertation]. University of Florida; 2010. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0041972.

Council of Science Editors:

Das R. Magnetism in nanoscale materials, effect of finite size and dipolar interactions. [Doctoral Dissertation]. University of Florida; 2010. Available from: http://ufdc.ufl.edu/UFE0041972

University of Florida

9. Tongay, Sefaattin. Graphite-Graphene Semiconductor Junctions and Magneto-Dielectric Coupling in Schottky Diodes.

Degree: PhD, Physics, 2010, University of Florida

URL: http://ufdc.ufl.edu/UFE0041457

► The goal of this dissertation is to incorporate graphite and graphene into today's semiconductor technology as a Schottky barrier diodes (metal / semiconductor junctions) that… (more)

▼ The goal of this dissertation is to incorporate graphite and graphene into today's semiconductor technology as a Schottky barrier diodes (metal / semiconductor junctions) that are widely used in metal semiconductor field effect transistors (MESFETs), high electron mobility transistors (HEMTs), high temperature and frequency devices, solar cells and sensors/detectors. The first part of the dissertation aims to give the reader a general idea about the physics at the metal-semiconductor junctions and essential theory background. The second chapter of the dissertation questions effects of temperature and magnetic field on the diode characteristics of Schottky junctions. In this chapter, we present observation of negative magnetocapacitance on GaAs:Si/Au junctions and fully equipped with the theory, we present a phenomenological explanation for the observed effect. In the third chapter, we for the first time introduce multi-layer-graphene as a metal (semimetal) electrode to form Schottky barriers on various technologically significant semiconductors such as Si, GaAs, SiC and GaN. Multi-layer-graphene/ semiconductor junctions not only display good current-voltage (I-V) and capacitance-voltage (C-V) characteristics but also are significant since the Schottky barrier height and characteristics are mainly governed by the interaction and bond formation at few layers on the metal and semiconductor interface. This automatically implies that the presented results also hold for graphene/semiconductor junctions. Chapter 4, takes the Schottky formation at the multi-layer-graphene(graphene)/ semiconductor junction to another level and aims to change the Fermi level of the metal electrode by intercalation with Bromine and tune the barrier height. Observed results are significant in MESFET technology since different barrier height are desired depending on the application. The remainder of the dissertation, focuses on the properties of graphite and graphene to have more understanding about the content presented in the previous chapters. Chapter 5, gives a brief theory background about graphite and graphene while chapter 6 and chapter 7 discuss electrical properties of graphite at high temperatures where it starts to decouple from each graphene layer and acts as bi-layer graphene and with bromine intercation where there is c-axis lattice constant expansion and each graphene plane becomes more isolated. Chapter 8, gives a detailed description about epitaxial graphene growth in SiC by joule annealing technique, and we end the chapter with future directions. ( en ) Advisors/Committee Members: Hebard, Arthur F. (committee chair), Rinzler, Andrew G. (committee member), Biswas, Amlan (committee member), Maslov, Dmitrii (committee member), Pearton, Stephen J. (committee member).

Subjects/Keywords: Atoms; Bromine; Carbon; Electrical resistivity; Electrons; Graphene; Graphite; Room temperature; Semiconductors; Temperature dependence; carbon, condensed, device, electronic, gallium, gan, graphene, graphite, hemts, hightemperature, intercalation, magnetization, magnetodielectric, mesfet, mosfet, optical, quantum, schottky, semiconductors, silicon

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APA (6^th Edition):

Tongay, S. (2010). Graphite-Graphene Semiconductor Junctions and Magneto-Dielectric Coupling in Schottky Diodes. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0041457

Chicago Manual of Style (16^th Edition):

Tongay, Sefaattin. “Graphite-Graphene Semiconductor Junctions and Magneto-Dielectric Coupling in Schottky Diodes.” 2010. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0041457.

MLA Handbook (7^th Edition):

Tongay, Sefaattin. “Graphite-Graphene Semiconductor Junctions and Magneto-Dielectric Coupling in Schottky Diodes.” 2010. Web. 18 Oct 2019.

Vancouver:

Tongay S. Graphite-Graphene Semiconductor Junctions and Magneto-Dielectric Coupling in Schottky Diodes. [Internet] [Doctoral dissertation]. University of Florida; 2010. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0041457.

Council of Science Editors:

Tongay S. Graphite-Graphene Semiconductor Junctions and Magneto-Dielectric Coupling in Schottky Diodes. [Doctoral Dissertation]. University of Florida; 2010. Available from: http://ufdc.ufl.edu/UFE0041457

University of Florida

10. Aoyama, Christopher P. Experimental Studies of Low Dimensional Quantum Antiferromagnets.

Degree: PhD, Physics, 2015, University of Florida

URL: http://ufdc.ufl.edu/UFE0047828

► Quantum magnets in low dimensions lead to some of the most interesting physics in condensed matter physics. The study of these systems requires measurements at… (more)

Subjects/Keywords: Capacitance; Electric fields; Electrodes; Magnetic fields; Magnetism; Magnetization; Magnetometers; Magnets; Specific heat; Torque; antiferromagnets

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APA (6^th Edition):

Aoyama, C. P. (2015). Experimental Studies of Low Dimensional Quantum Antiferromagnets. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0047828

Chicago Manual of Style (16^th Edition):

Aoyama, Christopher P. “Experimental Studies of Low Dimensional Quantum Antiferromagnets.” 2015. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0047828.

MLA Handbook (7^th Edition):

Aoyama, Christopher P. “Experimental Studies of Low Dimensional Quantum Antiferromagnets.” 2015. Web. 18 Oct 2019.

Vancouver:

Aoyama CP. Experimental Studies of Low Dimensional Quantum Antiferromagnets. [Internet] [Doctoral dissertation]. University of Florida; 2015. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0047828.

Council of Science Editors:

Aoyama CP. Experimental Studies of Low Dimensional Quantum Antiferromagnets. [Doctoral Dissertation]. University of Florida; 2015. Available from: http://ufdc.ufl.edu/UFE0047828

University of Florida

11. Bhupathi, Pradeep. Construction of an Ultralow Temperature Cryostat and Transverse Acoustic Spectroscopy in Superfluid Helium-3 in Compressed Aerogels.

Degree: PhD, Physics, 2009, University of Florida

URL: http://ufdc.ufl.edu/UFE0024389

► An ultra low temperature cryostat is designed and implemented in this work to perform experiments at sub-millikelvin temperatures, specifically aimed at understanding the superfluid phases… (more)

▼ An ultra low temperature cryostat is designed and implemented in this work to perform experiments at sub-millikelvin temperatures, specifically aimed at understanding the superfluid phases of Helium-3 in various scenarios. The cryostat is a combination of a dilution refrigerator (Oxford Kelvinox 400) with a base temperature of 5.2 mK and a 48 mole copper block as the adiabatic nuclear demagnetization stage with a lowest temperature of about 200 microK. With the various techniques implemented for limiting the ambient heat leak to the cryostat, we were able to stay below 1 mK for longer than 5 weeks. The details of design, construction and performance of the cryostat are presented. We measured high frequency shear acoustic impedance in superfluid Helium-3 in 98% porosity aerogel at pressures of 29 bar and 32 bar in magnetic fields upto 3 kG with the aerogel cylinder compressed along the symmetry axis to generate global anisotropy. With 5% compression, there is an indication of a supercooled A-like to B-like transition in aerogel in a wider temperature width than the A phase in the bulk, while at 10% axial compression, the A-like to B-like transition is absent on cooling down to 300 microK in zero magnetic field and in magnetic fields up to 3 kG. This behavior is in contrast to that in Helium-3 in uncompressed aerogels, in which the supercooled A-like to B-like transitions have been identified by various experimental techniques. Our result is consistent with theoretical predictions. To characterize the anisotropy in compressed aerogels, optical birefringence is measured in 98% porosity silica aerogel samples subjected to various degrees of uniaxial compression up to 15% strain, with wavelengths between 200 to 800 nm. Uncompressed aerogels exhibit no or a minimal degree of birefringence, indicating the isotropic nature of the material over the length scale of the wavelength. Uniaxial compression of aerogel introduces global anisotropy, which produces birefringence in the material. We observed a quasi-linear strain dependence in Delta n = n_e - n_o in compressed aerogels, where n_e(o) is the index of refraction for the extraordinary (ordinary) ray of light that has its polarization parallel to the compression axis. Incidentally, this effect has potential applications for aerogels as tunable waveplates operating in a broad spectral range. ( en ) Advisors/Committee Members: Lee, Yoonseok (committee chair), Kumar, Pradeep P. (committee member), Meisel, Mark W. (committee member), Biswas, Amlan (committee member), Scott, Michael J. (committee member).

Subjects/Keywords: Aerogels; Cooling; Cryostats; Heating; Liquids; Low temperature; Magnetic fields; Magnetism; Pumps; Transmittance; aerogels, bhupathi, birefringence, cryostat, helium, spectroscopy, superfluid, ultrasound

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APA (6^th Edition):

Bhupathi, P. (2009). Construction of an Ultralow Temperature Cryostat and Transverse Acoustic Spectroscopy in Superfluid Helium-3 in Compressed Aerogels. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0024389

Chicago Manual of Style (16^th Edition):

Bhupathi, Pradeep. “Construction of an Ultralow Temperature Cryostat and Transverse Acoustic Spectroscopy in Superfluid Helium-3 in Compressed Aerogels.” 2009. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0024389.

MLA Handbook (7^th Edition):

Bhupathi, Pradeep. “Construction of an Ultralow Temperature Cryostat and Transverse Acoustic Spectroscopy in Superfluid Helium-3 in Compressed Aerogels.” 2009. Web. 18 Oct 2019.

Vancouver:

Bhupathi P. Construction of an Ultralow Temperature Cryostat and Transverse Acoustic Spectroscopy in Superfluid Helium-3 in Compressed Aerogels. [Internet] [Doctoral dissertation]. University of Florida; 2009. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0024389.

Council of Science Editors:

Bhupathi P. Construction of an Ultralow Temperature Cryostat and Transverse Acoustic Spectroscopy in Superfluid Helium-3 in Compressed Aerogels. [Doctoral Dissertation]. University of Florida; 2009. Available from: http://ufdc.ufl.edu/UFE0024389

University of Florida

12. Uzakbaiuly, Berik. Infrared Spectroscopy of High Purity Silicon and Silicon Immersion Gratings.

Degree: PhD, Physics, 2016, University of Florida

URL: http://ufdc.ufl.edu/UFE0049916

► Silicon immersion gratings (SIGs) have offered a great deal of improvement in high resolution infrared spectroscopy used for astronomy. They offer a 3.4 times gain… (more)

Subjects/Keywords: Conductivity; Impurities; Light refraction; Moths; Reflectance; Silicon; Spectrometers; Transmittance; Vibration mode; Wavelengths; grating – immersion – impurity – silicon

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APA (6^th Edition):

Uzakbaiuly, B. (2016). Infrared Spectroscopy of High Purity Silicon and Silicon Immersion Gratings. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0049916

Chicago Manual of Style (16^th Edition):

Uzakbaiuly, Berik. “Infrared Spectroscopy of High Purity Silicon and Silicon Immersion Gratings.” 2016. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0049916.

MLA Handbook (7^th Edition):

Uzakbaiuly, Berik. “Infrared Spectroscopy of High Purity Silicon and Silicon Immersion Gratings.” 2016. Web. 18 Oct 2019.

Vancouver:

Uzakbaiuly B. Infrared Spectroscopy of High Purity Silicon and Silicon Immersion Gratings. [Internet] [Doctoral dissertation]. University of Florida; 2016. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0049916.

Council of Science Editors:

Uzakbaiuly B. Infrared Spectroscopy of High Purity Silicon and Silicon Immersion Gratings. [Doctoral Dissertation]. University of Florida; 2016. Available from: http://ufdc.ufl.edu/UFE0049916

University of Florida

13. Verma,Prakash. Increasing the Applicability of Density Functional Theory.

Degree: PhD, Chemistry, 2011, University of Florida

URL: http://ufdc.ufl.edu/UFE0042848

► According to density functional theory(DFT), the density is a sufficient variable for the description of degenerate or non-degenerate ground state of molecules. The density is… (more)

Subjects/Keywords: Approximation; Density functional theory; Eigenvalues; Electrons; Energy; Flux density; Ion density; Ionization; Orbitals; Particle density; bartlett – dft – non – oep – rpa

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APA (6^th Edition):

Verma,Prakash. (2011). Increasing the Applicability of Density Functional Theory. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0042848

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

Verma,Prakash. “Increasing the Applicability of Density Functional Theory.” 2011. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0042848.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

Verma,Prakash. “Increasing the Applicability of Density Functional Theory.” 2011. Web. 18 Oct 2019.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

Verma,Prakash. Increasing the Applicability of Density Functional Theory. [Internet] [Doctoral dissertation]. University of Florida; 2011. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0042848.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

Verma,Prakash. Increasing the Applicability of Density Functional Theory. [Doctoral Dissertation]. University of Florida; 2011. Available from: http://ufdc.ufl.edu/UFE0042848

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of Florida

14. Nittala, Krishna. In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films.

Degree: PhD, Materials Science and Engineering, 2012, University of Florida

URL: http://ufdc.ufl.edu/UFE0044015

► Solution deposited PZT based thin films have potential applications in embedded decoupling capacitors and pulse discharge capacitors. During solution deposition, precursor solution is deposited onto… (more)

▼ Solution deposited PZT based thin films have potential applications in embedded decoupling capacitors and pulse discharge capacitors. During solution deposition, precursor solution is deposited onto a substrate to obtain an amorphous film. The film is then crystallized by heating it at a high temperature (~600 - 700°C). Conditions during the crystallization anneal such as precursor stoichiometry in solution, heating rate and adhesion layer in the substrate are known to influence phase and texture evolution in these films. However, a mechanistic understanding of the changes taking place in these thin films during crystallization is lacking. A better understanding of the crystallization processes in these thin films could enable tailoring the properties of thin films to suit specific applications. To explore the crystallization process in solution deposited PZT thin films, high temperature in situ laboratory and synchrotron X-ray diffraction based techniques were developed. Taking advantage of the high X-ray flux available at synchrotron facilities such as beamline 6-ID-B, Advanced Photon Source, Argonne National Laboratory, crystalline phases formed in the thin films during crystallization at the high heating rates (0.5 – 60°C/s)typically used during film processing could be measured. Using a 2-D detector for these measurements allowed the simultaneous measurement of both phase and texture information during crystallization. Analytical treatment of the unconventional diffraction geometry used during the synchrotron based measurements was performed to develop methodologies for quantitative estimation of texture components. The nominal lead content in the starting solutions and the heating rate used during crystallization was observed to influence the sequence of phases formed during crystallization of the films. In films crystallized at fast heating rates,titanium segregation, probably due to diffusion of titanium from the adhesion layer, was observed. To further investigate the effect of adhesion layer on the crystallization behavior of these films, PZT films were solution deposited onto substrates with titanium (Ti), titanium oxide (TiOx) and zinc oxide (ZnO) adhesion layers. Phase evolution was observed to be unaffected by the adhesion layer. (111) oriented PZT films were obtained on all substrates and hence Ti diffusion from the adhesion layer appeared to have limited influence on texture control in these films. It is suggested that the (111) orientation of the perovskite phase is directly seeded by the Pt(111) texture. ( en ) Advisors/Committee Members: Jones, Jacob L. (committee chair), Phillpot, Simon R (committee member), Craciun, Valentin (committee member), Perry, Scott S. (committee member), Biswas, Amlan (committee member).

Subjects/Keywords: Adhesion; Crystallization; Fluorite; Heating; Lattice parameters; Perovskites; Solar X rays; Thin films; Titanium; Wave diffraction; diffraction – films – pzt – thin

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APA (6^th Edition):

Nittala, K. (2012). In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0044015

Chicago Manual of Style (16^th Edition):

Nittala, Krishna. “In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films.” 2012. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0044015.

MLA Handbook (7^th Edition):

Nittala, Krishna. “In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films.” 2012. Web. 18 Oct 2019.

Vancouver:

Nittala K. In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films. [Internet] [Doctoral dissertation]. University of Florida; 2012. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0044015.

Council of Science Editors:

Nittala K. In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films. [Doctoral Dissertation]. University of Florida; 2012. Available from: http://ufdc.ufl.edu/UFE0044015

University of Florida

15. Atallah, Pascale. Precision Polyolefins Additives for Extrusion Process.

Degree: PhD, Chemistry, 2013, University of Florida

URL: http://ufdc.ufl.edu/UFE0046148

► Extrusion of polyethylene leads to defects, such as meltfracture and sharkskin roughness when performed at high rates and pressures.Silicones and fluorocarbons are known to act… (more)

▼ Extrusion of polyethylene leads to defects, such as meltfracture and sharkskin roughness when performed at high rates and pressures.Silicones and fluorocarbons are known to act as slippery agents, reducing thosedefects. Typical silicones and fluorocarbon additives present a number oftechnology disadvantages. Because of their nature, commercial silicones andfluorocarbons do not mix well with polyethylene. Consequently, they have been used to coat thedie of the extruder before the addition of polyethylene. This method is notefficient for large scale production, since it requires frequent interruptionof the process to recoat the die. The approach we envision eliminates theseproblems entirely. This dissertation describes the synthesis of novelextrusion aids for polyethylene using the precision branching technologydeveloped in the Wagener group. Precisely placed silicones and fluorinebranches of various branch lengths between precision long-run polyethylenesegments can be synthesized using Acyclic Diene Metathesis (ADMET). Thelong-run polyethylene segments between branches will allow for better mixing ofthe extrusion aid additive in the extruder, and equally important, the long runpolyethylene units between branches will co-crystallize with polyethylene afterexiting the extruder. This represents the first such application in extrusionaid technology. The purpose of this work is to identify successful syntheticmethods that will be used to produce extrusion aids in which the branch sizesand distances between branches can be varied. The goal is to find theappropriate polyethylene run length and branch size for optimum performance. At least three benefits accrue for these research results:1) the extrusion aid additive will be “locked” into the polymer (viaco-crystallization) leading a cleaner processing: 2) lower extrusion pressureswill be needed for the same output thus saving energy; 3) less die swell, meltfracture, and sharkskin effects will be observed, resulting in an improvedproduct. Very small amounts of the additive are needed to achieve all positiveeffects and low molecular weight polymers are enough to lead to positiveresults. ( en ) Advisors/Committee Members: WAGENER,KENNETH B (committee chair), APONICK,AARON (committee member), ENHOLM,JONATHAN E (committee member), BISWAS,AMLAN (committee member).

Subjects/Keywords: Alcohols; Catalysts; Chemicals; Monomers; Polyethylenes; Polymerization; Polymers; Silicones; Siloxanes; Solvents; additive – admet – extrusion – polyolefin – precision

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APA (6^th Edition):

Atallah, P. (2013). Precision Polyolefins Additives for Extrusion Process. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0046148

Chicago Manual of Style (16^th Edition):

Atallah, Pascale. “Precision Polyolefins Additives for Extrusion Process.” 2013. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0046148.

MLA Handbook (7^th Edition):

Atallah, Pascale. “Precision Polyolefins Additives for Extrusion Process.” 2013. Web. 18 Oct 2019.

Vancouver:

Atallah P. Precision Polyolefins Additives for Extrusion Process. [Internet] [Doctoral dissertation]. University of Florida; 2013. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0046148.

Council of Science Editors:

Atallah P. Precision Polyolefins Additives for Extrusion Process. [Doctoral Dissertation]. University of Florida; 2013. Available from: http://ufdc.ufl.edu/UFE0046148

University of Florida

16. Misra, Rajiv. Experiments on Electron Interaction and Localization in Disordered Magnetic Thin Films.

Degree: PhD, Physics, 2009, University of Florida

URL: http://ufdc.ufl.edu/UFE0024640

► We present results of experimental in-situ magneto-transport studies on thin ferromagnetic films for a range of disorder values, characterized by sheet resistance R₀=R_xx(T = 5… (more)

Subjects/Keywords: Conductivity; Electric fields; Electric potential; Electrons; Gadolinium; Hall effect; Magnetic fields; Magnetism; Temperature dependence; Thin films; anomalous, disorder, ferromagnetism, gadolinium, hall, insulator, interactions, itinerant, localization, magnetoresistance, metal, spinwave, thinfilm

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APA (6^th Edition):

Misra, R. (2009). Experiments on Electron Interaction and Localization in Disordered Magnetic Thin Films. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0024640

Chicago Manual of Style (16^th Edition):

Misra, Rajiv. “Experiments on Electron Interaction and Localization in Disordered Magnetic Thin Films.” 2009. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0024640.

MLA Handbook (7^th Edition):

Misra, Rajiv. “Experiments on Electron Interaction and Localization in Disordered Magnetic Thin Films.” 2009. Web. 18 Oct 2019.

Vancouver:

Misra R. Experiments on Electron Interaction and Localization in Disordered Magnetic Thin Films. [Internet] [Doctoral dissertation]. University of Florida; 2009. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0024640.

Council of Science Editors:

Misra R. Experiments on Electron Interaction and Localization in Disordered Magnetic Thin Films. [Doctoral Dissertation]. University of Florida; 2009. Available from: http://ufdc.ufl.edu/UFE0024640

University of Florida

17. Devarajan, Sunil Poondi. Growth Properties and Reactivity of Oxygen Phases on Platinum (111) and Palladium (111).

Degree: PhD, Chemical Engineering, 2012, University of Florida

URL: http://ufdc.ufl.edu/UFE0044036

► Oxidation reactions of Pt and Pd under lean burn or oxygen rich conditions are crucial to heterogeneous catalysis systems used in oxidation of hydrocarbons, fabrication… (more)

Subjects/Keywords: Alkanes; Atoms; Desorption; Molecules; Oxidation; Oxides; Oxygen; Propane; Surface temperature; Weaving; alkane – catalysis – desorption – oxides – palladium – platinum – stm – surface – thermal

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APA (6^th Edition):

Devarajan, S. P. (2012). Growth Properties and Reactivity of Oxygen Phases on Platinum (111) and Palladium (111). (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0044036

Chicago Manual of Style (16^th Edition):

Devarajan, Sunil Poondi. “Growth Properties and Reactivity of Oxygen Phases on Platinum (111) and Palladium (111).” 2012. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0044036.

MLA Handbook (7^th Edition):

Devarajan, Sunil Poondi. “Growth Properties and Reactivity of Oxygen Phases on Platinum (111) and Palladium (111).” 2012. Web. 18 Oct 2019.

Vancouver:

Devarajan SP. Growth Properties and Reactivity of Oxygen Phases on Platinum (111) and Palladium (111). [Internet] [Doctoral dissertation]. University of Florida; 2012. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0044036.

Council of Science Editors:

Devarajan SP. Growth Properties and Reactivity of Oxygen Phases on Platinum (111) and Palladium (111). [Doctoral Dissertation]. University of Florida; 2012. Available from: http://ufdc.ufl.edu/UFE0044036

University of Florida

18. Jeen,Hyoung Jeen. Magnetoelectric Effects in Manganites.

Degree: PhD, Physics, 2011, University of Florida

URL: http://ufdc.ufl.edu/UFE0042870

► Research on manganites has been conducted for more than half century. Recent discoveries of colossal responses to external fields such as colossal magnetoresistance effects and… (more)

▼ Research on manganites has been conducted for more than half century. Recent discoveries of colossal responses to external fields such as colossal magnetoresistance effects and correlation among spin, orbital, and lattice in phase separated manganites and multiferroic manganites have motivated me to understand these materials. The main purpose of this dissertation is to understand magnetoelectric effects in phase separated (La_1-yPr_y)_1-xCa_xMnO₃ (LPCMO) thin films and multiferroic BiMnO₃ (BMO) thin films. First, high quality phase separated manganite thin films have been successfully grown. To grow the high quality manganite thin films, extensive effort was devoted to fine tuning of oxygen pressure, temperature, and laser fluence during film growth. As-grown films were characterized with various ex-situ techniques: magnetization measurements, transport measurements, x-ray diffraction, atomic force microscopy, and/or transmission electron microscopy to remove the effects of impurities and unwanted strains except substrate induced strain. Second, three major results were obtained in high quality phase separated LPCMO thin films. These results are based on the dynamic nature of phases in LPCMO. 1) LPCMO thin films showed single domain to multi-domain transition during cooling. This transition can be tuned by substrate stress induced in-plane magnetic anisotropy. 2) Evidence for the origin of colossal electroresistance (CER) effect has been observed. The CER is triggered by dielectrophoresis, or movements of ferromagnetic metallic (FMM) phase, which is manifested in anisotropic transport properties in microfabricated LPCMO cross structures. This fluidic nature of the FMM phase in LPCMO under high electric fields lead to exotic magnetoelectric effects. 3) Electric field effects on magnetotransport properties have been observed. This phenomena can also be tuned by the combined effect of substrate strain and current flow. This combined effect of electric and magnetic fields and strain at the interface of LPCMO suggest new ways to control magnetism (magnetotransport) with electric fields. Third, impurity-free and epitaxial BMO thin films were grown. These films showed ferromagnetism and ferroelectricity at low temperature. Magnetoelectric effects are discussed, especially magnetization change due to electric fields. ( en ) Advisors/Committee Members: Biswas, Amlan (committee chair), Dorsey, Alan T (committee member), Lee, Yoonseok (committee member), Hebard, Arthur F (committee member), Norton, David P (committee member).

Subjects/Keywords: Anisotropy; Electric fields; Ions; Magnetic fields; Magnetism; Magnetization; Magnets; Nonprofit organizations; Oxygen; Thin films; cer – cmr – magnetoelectric – manganites – multiferroics – pld

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APA (6^th Edition):

Jeen, J. (2011). Magnetoelectric Effects in Manganites. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0042870

Chicago Manual of Style (16^th Edition):

Jeen, Jeen,Hyoung. “Magnetoelectric Effects in Manganites.” 2011. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0042870.

MLA Handbook (7^th Edition):

Jeen, Jeen,Hyoung. “Magnetoelectric Effects in Manganites.” 2011. Web. 18 Oct 2019.

Vancouver:

Jeen J. Magnetoelectric Effects in Manganites. [Internet] [Doctoral dissertation]. University of Florida; 2011. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0042870.

Council of Science Editors:

Jeen J. Magnetoelectric Effects in Manganites. [Doctoral Dissertation]. University of Florida; 2011. Available from: http://ufdc.ufl.edu/UFE0042870

University of Florida

19. Berke, Kara. Graphene Growth, Doping, and Characterization for Device Applications.

Degree: PhD, Physics, 2013, University of Florida

URL: http://ufdc.ufl.edu/UFE0046289

► This dissertation aims to describe fundamental physics concepts regarding the fabrication and characterization of graphene for device applications. Ultimately, the goal of this research is… (more)

▼ This dissertation aims to describe fundamental physics concepts regarding the fabrication and characterization of graphene for device applications. Ultimately, the goal of this research is to further knowledge of graphene systems in hopes that commercial applications can soon be The first chapter introduces the reader to graphene, beginning with a brief history of its discovery in 2004 and moving on to cover basic structural and electrical properties. A basic knowledge of solid state physics is assumed. The second chapter describes some of the common research techniques employed in subsequent chapters. This includes chemical vapor deposition synthesis methods used to produce the graphene used in Chapters 3 and 4. Also included is a brief explanation of the graphene Raman spectrum. Raman spectroscopy is used extensively throughout this dissertation, and an understanding of the underlying physical principles is key to interpreting the data. In chapter three, we investigate surface charge transfer as a means of doping graphene to increase the density of charge carriers. By applying the organic material bis(trifluoromethanesulfonyl)amide (TFSA) to the graphene surface, the resistivity of the samples decreases by 70%. We observe a dramatic increase in the hole concentration after doping, with only minimal reduction of carrier mobility. Raman spectra are consistent with hole doping, but more importantly indicate that the overall quality of the graphene is preserved during the process. Transmittance measurements are taken in the visible and near-infrared ranges indicating that TFSA-doping does not significantly increase overall sample reflectance. This has allowed TFSA-doped graphene to be implemented into a graphene/n-Si solar cell to achieve a record-breaking 8.6% power conversion efficency, and shows promise for other optoelectronic applications. Chapter four investigates the affect of lattice-matching between graphene and organic semiconductors on a Schottky Junction diode. This time, instead of applying an organic liquid to the graphene surface, the organic small molecule pentacene is deposited directly onto graphene by vapor deposition. Similarity between the structure of pentacene and graphene (both are comprised of hexagonal carbon subunits) allows the first few layers of pentacene molecules to adopt an orientation almost parallel to the graphene surface, whereas they typically adopt a perpendicular orientation when deposited on metallic substrates. A parallel orientation is preferable for vertical device architectures as it aligns the pentacene's high mobility axis in the direction of charge transport. However, diode performance was hindered by a large density of charge trapping sites, leading to a combination of Poole-Frenkel transport and thermionic emission; whereas in an ideal schottky diode, transport would be dominated by thermionic emission. The last chapter focuses on an alternative graphene growth process through epitaxial growth on SiC substrates via pulsed laser annealing (PLA). This process is further… Advisors/Committee Members: HEBARD,ARTHUR F (committee chair), BISWAS,AMLAN (committee member), STANTON,CHRISTOPHER JAY (committee member), GILA,BRENT P (committee member).

Subjects/Keywords: Annealing; Atoms; Carbon; Diodes; Doping; Electrons; Graphene; Orbitals; Phonons; Raman scattering; graphene

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APA (6^th Edition):

Berke, K. (2013). Graphene Growth, Doping, and Characterization for Device Applications. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0046289

Chicago Manual of Style (16^th Edition):

Berke, Kara. “Graphene Growth, Doping, and Characterization for Device Applications.” 2013. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0046289.

MLA Handbook (7^th Edition):

Berke, Kara. “Graphene Growth, Doping, and Characterization for Device Applications.” 2013. Web. 18 Oct 2019.

Vancouver:

Berke K. Graphene Growth, Doping, and Characterization for Device Applications. [Internet] [Doctoral dissertation]. University of Florida; 2013. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0046289.

Council of Science Editors:

Berke K. Graphene Growth, Doping, and Characterization for Device Applications. [Doctoral Dissertation]. University of Florida; 2013. Available from: http://ufdc.ufl.edu/UFE0046289

University of Florida

20. Buvaev, Sanal V. Magnetotransport Study of Disordered Thin Films.

Degree: PhD, Physics, 2014, University of Florida

URL: http://ufdc.ufl.edu/UFE0046226

► This work presents a magnetotransport study of disordered thin films and consists of two projects. The first project is a continuation of previous experience on… (more)

Subjects/Keywords: Bismuth; Conductivity; Electrons; Hall effect; Magnetic fields; Magnetism; Magnets; Magnons; Temperature dependence; Uniform Resource Locators; disordered – films – thin

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APA (6^th Edition):

Buvaev, S. V. (2014). Magnetotransport Study of Disordered Thin Films. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0046226

Chicago Manual of Style (16^th Edition):

Buvaev, Sanal V. “Magnetotransport Study of Disordered Thin Films.” 2014. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0046226.

MLA Handbook (7^th Edition):

Buvaev, Sanal V. “Magnetotransport Study of Disordered Thin Films.” 2014. Web. 18 Oct 2019.

Vancouver:

Buvaev SV. Magnetotransport Study of Disordered Thin Films. [Internet] [Doctoral dissertation]. University of Florida; 2014. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0046226.

Council of Science Editors:

Buvaev SV. Magnetotransport Study of Disordered Thin Films. [Doctoral Dissertation]. University of Florida; 2014. Available from: http://ufdc.ufl.edu/UFE0046226

University of Florida

21. Liu, Bo. Carbon Nanotube Enabled Vertical Field Effect Transistors and Their Device Derivatives.

Degree: PhD, Physics, 2010, University of Florida

URL: http://ufdc.ufl.edu/UFE0042342

► A carbon nanotube enabled vertical field effect transistor (CN-VFET) utilizes a dilute carbon nanotube (CNT) random network as the source electrode, and features a stack… (more)

▼ A carbon nanotube enabled vertical field effect transistor (CN-VFET) utilizes a dilute carbon nanotube (CNT) random network as the source electrode, and features a stack gate-dielectric-source-channel-drain structure as opposed to the lateral channel between the source and drain structure found in a conventional organic thin film transistor. The structural and electronic properties of the single wall carbon nanotubes help to fully unlock the potential of this new device architecture. The high aspect ratio of the CNTs allows a percolating random network to be made easily with open areas between the CNTs that the electric field can penetrate without much penalty on the conductivity. The low density of states of the CNTs permits the electric field tuning of their Fermi level, while their well passivated surface inhibit covalent bond formation that can cause Fermi level pinning, leaving the barrier height predisposed to gate field modulation. By adding an electroluminescent layer and modifying the top contact to allow electron injection, a carbon nanotube enabled vertical organic light emitting transistor (CN-VOLET) is demonstrated. The luminance is controlled by the gate field which modulates the source-drain current by modulating the hole injection barrier at the CNT source electrode. Such gate control should permit new pixel drive schemes and affords the potential for increased device lifetimes. Returning to the base CN-VFET a non-volatile memory element is realized by adding a charge storage layer on top of the dielectric. The memory element demonstrates a large, fully gate sweep programmable, hysteresis in the cyclic transfer curves exhibiting on/off ratios > 4 orders of magnitude. The carbon nanotube random network source electrode facilitates charge injection into the charge storage layer, realizing the strong memory effect without sacrificing mobility in the vertical channel. Given their intrinsically simple fabrication and compact size CN-VFETs could provide a path to cost-effective, high density organic memory devices. By utilizing a blend of p-type and n-type organic semiconductors as the channel material an ambipolar CN-VFET is demonstrated. By the virtue of their short channel lengths (without the need for high resolution patterning) the organic blend, ambipolar CN-VFET has important potential advantages that are discussed. Inverters based on ambipolar CN-VFETs are demonstrated. In contrast to inverters made from lateral channel ambipolar transistors, inverters made using the ambipolar CN-VFETs exhibit low leakage currents due to a diode-like transport characteristic in the devices. ( en ) Advisors/Committee Members: Rinzler, Andrew G. (committee chair), Biswas, Amlan (committee member), Hershfield, Selman P. (committee member), Hebard, Arthur F. (committee member), So, Franky (committee member).

Subjects/Keywords: Carbon nanotubes; Dielectric materials; Drains; Electric current; Electric potential; Electrodes; Field effect transistors; Inverters; Nanotubes; Transistors

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APA (6^th Edition):

Liu, B. (2010). Carbon Nanotube Enabled Vertical Field Effect Transistors and Their Device Derivatives. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0042342

Chicago Manual of Style (16^th Edition):

Liu, Bo. “Carbon Nanotube Enabled Vertical Field Effect Transistors and Their Device Derivatives.” 2010. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0042342.

MLA Handbook (7^th Edition):

Liu, Bo. “Carbon Nanotube Enabled Vertical Field Effect Transistors and Their Device Derivatives.” 2010. Web. 18 Oct 2019.

Vancouver:

Liu B. Carbon Nanotube Enabled Vertical Field Effect Transistors and Their Device Derivatives. [Internet] [Doctoral dissertation]. University of Florida; 2010. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0042342.

Council of Science Editors:

Liu B. Carbon Nanotube Enabled Vertical Field Effect Transistors and Their Device Derivatives. [Doctoral Dissertation]. University of Florida; 2010. Available from: http://ufdc.ufl.edu/UFE0042342

University of Florida

22. Miller, Kevin H. Infrared Study of Magnetic and Electric Excitations in Novel Complex Oxides.

Degree: PhD, Physics, 2013, University of Florida

URL: http://ufdc.ufl.edu/UFE0045238

► The contents of this thesis report the characterization of novel complex-oxide single crystals that are candidates for the discovery of new multiferroic materials and the… (more)

Subjects/Keywords: Conceptual lattices; Crystals; Dielectric materials; Electric fields; Magnetic fields; Magnetism; Magnets; Oscillators; Phonons; Reflectance; magnons – multiferroic

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APA (6^th Edition):

Miller, K. H. (2013). Infrared Study of Magnetic and Electric Excitations in Novel Complex Oxides. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0045238

Chicago Manual of Style (16^th Edition):

Miller, Kevin H. “Infrared Study of Magnetic and Electric Excitations in Novel Complex Oxides.” 2013. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0045238.

MLA Handbook (7^th Edition):

Miller, Kevin H. “Infrared Study of Magnetic and Electric Excitations in Novel Complex Oxides.” 2013. Web. 18 Oct 2019.

Vancouver:

Miller KH. Infrared Study of Magnetic and Electric Excitations in Novel Complex Oxides. [Internet] [Doctoral dissertation]. University of Florida; 2013. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0045238.

Council of Science Editors:

Miller KH. Infrared Study of Magnetic and Electric Excitations in Novel Complex Oxides. [Doctoral Dissertation]. University of Florida; 2013. Available from: http://ufdc.ufl.edu/UFE0045238

University of Florida

23. Singh, Guneeta. Size Effects in Phase Separated Manganite Nanostructures.

Degree: PhD, Physics, 2009, University of Florida

URL: http://ufdc.ufl.edu/UFE0024399

► Size Effects in Phase Separated Manganite Nanostructures This work describes a detailed nanometer scale experimental study of a phenomenon known as phase separation, in a… (more)

▼ Size Effects in Phase Separated Manganite Nanostructures This work describes a detailed nanometer scale experimental study of a phenomenon known as phase separation, in a class of ceramic materials know as the manganites. The manganite (La,Pr,Ca)MnO3 was chosen for the studies due to the micrometer scale phase separation in this particular material. In (La,Pr,Ca)MnO3 phase separation is electronic, magnetic and structural in nature, and occurs within a small window of temperatures. Within this temperature range the sample becomes electronically `texturized' in that the sample is no longer homogeneously insulating or conducting, even though the physical chemistry and properties of the sample remain constant. It contains a mix of both insulating and conducting properties within well defined spatial regions. The regions are on the order of a micrometer. The conducting regions are ferromagnetic and have a psuedo cubic (orthorhombic but very nearly cubic) atomic structure while the insulating regions are anitiferromagnetic with an orthorhombic, distorted structure. To understand the physics of the individual phase separated regions a technique was developed for fabricating narrow (La,Pr,Ca)MnO3 wires (in the shape of bridges) of nanometer width such that during the phase separated temperature range, one or a few phase separated regions form along the length of the wire. This has allowed transport measurements across a discrete number of phase separated regions giving physical insights into the nature of the individual regions and the boundaries between them. In this way, it is possible to identify several distinct physical mechanisms that act simultaneously on the nanometer scale giving rise to the unusual properties observed in bulk or unpatterned thin film samples. Transport measurements across the narrow bridges as a function of temperature and magnetic field revealed evidence of alternating insulating and metallic regions spanning the bridge width, aligned along the length of the bridge. First, evidence of direct electron tunneling between two or more ferromagnetic metallic (FM) regions separated by antiferromagnetic insulating (AFI) regions was observed. Magnetoresistance measurements reveal that often, the ferromagnetic metallic regions have different coercive fields (possibly due to varying sizes) which affect the tunnel probabilities (i.e. the probability decreases when the spins are anti-aligned). This gives rise to large and sharp low field peaks when resistance is measured as a function of magnetic field – the classical signature of tunneling magnetoresistance (TMR). Further, signatures of an exchange bias which gives rise to asymmetric TMR peaks were also identified in the measurements. These two phenomenon can help explain anomalous low field magnetoresistance observed in bulk and unpatterned thin film samples. The data also reveal that at temperatures below the phase separated temperature range, when the unpatterned thin film samples are nearly fully ferromagnetic metallic, the narrow bridges in contrast… Advisors/Committee Members: Hebard, Arthur F. (committee chair), Biswas, Amlan (committee member), Hirschfeld, Peter J. (committee member), Tanner, David B. (committee member), Nino, Juan C. (committee member).

Subjects/Keywords: Capacitance; Electric current; Electric fields; Electrical phases; Magnetic fields; Magnetism; Magnets; Orbitals; Thin films; Transition temperature; bias, blockade, colossal, coulomb, domain, electroresistance, exchange, film, insulating, intrinsic, laprcamno, magnetiresistance, magnetoresistance, manganite, nano, nanofabrication, nanostructures, perovskite, phase, polarization, separation, simmons, spin, stripe, thin, tunneling, wall

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APA (6^th Edition):

Singh, G. (2009). Size Effects in Phase Separated Manganite Nanostructures. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0024399

Chicago Manual of Style (16^th Edition):

Singh, Guneeta. “Size Effects in Phase Separated Manganite Nanostructures.” 2009. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0024399.

MLA Handbook (7^th Edition):

Singh, Guneeta. “Size Effects in Phase Separated Manganite Nanostructures.” 2009. Web. 18 Oct 2019.

Vancouver:

Singh G. Size Effects in Phase Separated Manganite Nanostructures. [Internet] [Doctoral dissertation]. University of Florida; 2009. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0024399.

Council of Science Editors:

Singh G. Size Effects in Phase Separated Manganite Nanostructures. [Doctoral Dissertation]. University of Florida; 2009. Available from: http://ufdc.ufl.edu/UFE0024399

University of Florida

24. Timmerwilke, John M. Point Contact Studies of Iron Based Superconductors.

Degree: PhD, Physics, 2013, University of Florida

URL: http://ufdc.ufl.edu/UFE0045403

► This work presents spectroscopic measurements on Cobalt doped Barium Iron Arsenide at different dopings. The technique used is Point-Contact Spectroscopy, PCS. This technique is well… (more)

Subjects/Keywords: Anisotropy; Crystals; Doping; Electric potential; Electrons; Spectroscopy; Superconductivity; Superconductors; Symmetry; Uniform Resource Locators; iron-based – point-contact – superconductivity

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APA (6^th Edition):

Timmerwilke, J. M. (2013). Point Contact Studies of Iron Based Superconductors. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0045403

Chicago Manual of Style (16^th Edition):

Timmerwilke, John M. “Point Contact Studies of Iron Based Superconductors.” 2013. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0045403.

MLA Handbook (7^th Edition):

Timmerwilke, John M. “Point Contact Studies of Iron Based Superconductors.” 2013. Web. 18 Oct 2019.

Vancouver:

Timmerwilke JM. Point Contact Studies of Iron Based Superconductors. [Internet] [Doctoral dissertation]. University of Florida; 2013. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0045403.

Council of Science Editors:

Timmerwilke JM. Point Contact Studies of Iron Based Superconductors. [Doctoral Dissertation]. University of Florida; 2013. Available from: http://ufdc.ufl.edu/UFE0045403

University of Florida

25. Miao, Xiaochang. Fundamental Studies of Graphene/Graphite and Graphene Based Schottky Photovoltaic Devices.

Degree: PhD, Physics, 2013, University of Florida

URL: http://ufdc.ufl.edu/UFE0045658

► In the carbon allotropes family, graphene is one of the most versatile members and has been extensively studied since 2004. The goal of this dissertation… (more)

▼ In the carbon allotropes family, graphene is one of the most versatile members and has been extensively studied since 2004. The goal of this dissertation is not only to investigate the novel fundamental science of graphene and its three-dimensional sibling, graphite, but also to explore graphene's promising potential in modern electronic and optoelectronic devices. The first two chapters provide a concise introduction to the fundamental solid state physics of graphene (as well as graphite) and the physics at the metal/semiconductor interfaces. In the third chapter, we demonstrate the formation of Schottky junctions at the interfaces of graphene (semimetal) and various inorganic semiconductors that play dominating roles in today's semiconductor technology, such as Si, SiC, GaAs and GaN. As shown from their current-voltage (I-V) and capacitance-voltage (C-V) characteristics, the interface physics can be well described within the framework of the Schottky-Mott model. The results are also well consist with that from our previous studies on graphite based Schottky diodes. In the fourth chapter, as an extension of graphene based Schottky work, we investigate the photovoltaic (PV) effect of graphene/Si junctions after chemically doped with an organic polymer (TFSA). The power conversion efficiency of the solar cell improves from 1.9% to 8.6% after TFSA doping, which is the record in all graphene based PVs. The I-V, C-V and external quantum efficiency measurements suggest that such a significant enhancement in the device performance can be attribute to a doping-induced decrease in the series resistance and a simultaneous increase in the built-in potential. In the fifth chapter, we investigate for the first time the effect of uniaxial strains on magneto-transport properties of graphene. We find that low-temperature weak localization effect in monolayer graphene is gradually suppressed under increasing strains, which is due to a strain-induced decreased intervalley-scattering rate. In chapter 6, we study the high vacuum thermal annealing effect on an unconventional ferromagnetism (FM) in highly oriented pyrolytic graphite (HOPG). The FM diminishes and eventually disappears in annealed samples accompanied by improved electrical transport properties and crystalinity. Our results indicate that the FM is mainly coming from the lattice imperfections. ( en ) Advisors/Committee Members: Hebard, Arthur F (committee chair), Biswas, Amlan (committee member), Cheng, Hai Ping (committee member), Tanner, David B (committee member), Appleton, Billy Ray (committee member).

Subjects/Keywords: Doping; Electric current; Electrons; Graphene; Graphite; Magnetism; Photovoltaic cells; Physics; Semiconductors; Symmetry; ferromagnetism – graphene – graphite – magneto-transport – photovoltaics – schottky

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APA (6^th Edition):

Miao, X. (2013). Fundamental Studies of Graphene/Graphite and Graphene Based Schottky Photovoltaic Devices. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0045658

Chicago Manual of Style (16^th Edition):

Miao, Xiaochang. “Fundamental Studies of Graphene/Graphite and Graphene Based Schottky Photovoltaic Devices.” 2013. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0045658.

MLA Handbook (7^th Edition):

Miao, Xiaochang. “Fundamental Studies of Graphene/Graphite and Graphene Based Schottky Photovoltaic Devices.” 2013. Web. 18 Oct 2019.

Vancouver:

Miao X. Fundamental Studies of Graphene/Graphite and Graphene Based Schottky Photovoltaic Devices. [Internet] [Doctoral dissertation]. University of Florida; 2013. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0045658.

Council of Science Editors:

Miao X. Fundamental Studies of Graphene/Graphite and Graphene Based Schottky Photovoltaic Devices. [Doctoral Dissertation]. University of Florida; 2013. Available from: http://ufdc.ufl.edu/UFE0045658

University of Florida

26. Mickel,Patrick R. 'Soft Electronic Matter', Magnetoelectric Coupling, and Multiferroism in Complex Oxides.

Degree: PhD, Physics, 2011, University of Florida

URL: http://ufdc.ufl.edu/UFE0043236

► This thesis has focused on the electronic and magnetic properties of thin-film oxide crystals. Oxides are home to some of the richest physics in condensed… (more)

Subjects/Keywords: Capacitance; Conceptual lattices; Dielectric materials; Electric fields; Electrical phases; Magnetic fields; Magnetism; Magnetization; Magnets; Orbitals; dielectric – film – magnetodielectric – magnetoelectric – manganite – multiferroic – phase – soft – strain – thermodynamics – thin

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APA (6^th Edition):

R, M. (2011). 'Soft Electronic Matter', Magnetoelectric Coupling, and Multiferroism in Complex Oxides. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0043236

Chicago Manual of Style (16^th Edition):

R, Mickel,Patrick. “'Soft Electronic Matter', Magnetoelectric Coupling, and Multiferroism in Complex Oxides.” 2011. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0043236.

MLA Handbook (7^th Edition):

R, Mickel,Patrick. “'Soft Electronic Matter', Magnetoelectric Coupling, and Multiferroism in Complex Oxides.” 2011. Web. 18 Oct 2019.

Vancouver:

R M. 'Soft Electronic Matter', Magnetoelectric Coupling, and Multiferroism in Complex Oxides. [Internet] [Doctoral dissertation]. University of Florida; 2011. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0043236.

Council of Science Editors:

R M. 'Soft Electronic Matter', Magnetoelectric Coupling, and Multiferroism in Complex Oxides. [Doctoral Dissertation]. University of Florida; 2011. Available from: http://ufdc.ufl.edu/UFE0043236

University of Florida

27. Dasbiswas, Kinjal. Defects in Novel Superfluids Supersolid Helium and Cold Gases.

Degree: PhD, Physics, 2012, University of Florida

URL: http://ufdc.ufl.edu/UFE0044532

► We investigate the role played by various topological defects, especially crystal dislocations and super?uid vortices, in some novel super?uids - such as the putative supersolid… (more)

Subjects/Keywords: Atoms; Eigenvalues; Energy; Grain boundaries; Ground state; Helium; Magnetic fields; Quantum tunneling; Superfluidity; Velocity; bec – dislocation – superfluid – supersolid – vortex

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APA (6^th Edition):

Dasbiswas, K. (2012). Defects in Novel Superfluids Supersolid Helium and Cold Gases. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0044532

Chicago Manual of Style (16^th Edition):

Dasbiswas, Kinjal. “Defects in Novel Superfluids Supersolid Helium and Cold Gases.” 2012. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0044532.

MLA Handbook (7^th Edition):

Dasbiswas, Kinjal. “Defects in Novel Superfluids Supersolid Helium and Cold Gases.” 2012. Web. 18 Oct 2019.

Vancouver:

Dasbiswas K. Defects in Novel Superfluids Supersolid Helium and Cold Gases. [Internet] [Doctoral dissertation]. University of Florida; 2012. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0044532.

Council of Science Editors:

Dasbiswas K. Defects in Novel Superfluids Supersolid Helium and Cold Gases. [Doctoral Dissertation]. University of Florida; 2012. Available from: http://ufdc.ufl.edu/UFE0044532

University of Florida

28. Nasrollahi, Zahra. Spectroscopoic Studies of Polymers in Transmissive/Absorptive Electrochromic Devices, and Doped Graphite.

Degree: PhD, Physics, 2014, University of Florida

URL: http://ufdc.ufl.edu/UFE0045420

► Electrochromic polymers (ECPs) exhibit reversible optical modulation in a wide spectral range as a function of an externally applied voltage. In this work, ECPs have… (more)

Subjects/Keywords: Charge carriers; Conductivity; Dielectric materials; Doping; Electronics; Electrons; Graphite; Polymers; Reflectance; Temperature dependence; electrochromic – polymer – transmissive

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APA (6^th Edition):

Nasrollahi, Z. (2014). Spectroscopoic Studies of Polymers in Transmissive/Absorptive Electrochromic Devices, and Doped Graphite. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0045420

Chicago Manual of Style (16^th Edition):

Nasrollahi, Zahra. “Spectroscopoic Studies of Polymers in Transmissive/Absorptive Electrochromic Devices, and Doped Graphite.” 2014. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0045420.

MLA Handbook (7^th Edition):

Nasrollahi, Zahra. “Spectroscopoic Studies of Polymers in Transmissive/Absorptive Electrochromic Devices, and Doped Graphite.” 2014. Web. 18 Oct 2019.

Vancouver:

Nasrollahi Z. Spectroscopoic Studies of Polymers in Transmissive/Absorptive Electrochromic Devices, and Doped Graphite. [Internet] [Doctoral dissertation]. University of Florida; 2014. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0045420.

Council of Science Editors:

Nasrollahi Z. Spectroscopoic Studies of Polymers in Transmissive/Absorptive Electrochromic Devices, and Doped Graphite. [Doctoral Dissertation]. University of Florida; 2014. Available from: http://ufdc.ufl.edu/UFE0045420

University of Florida

29. Mhin, Sung Wook. Crystallization Behavior of Solution Deposited Lead Zirconate Titanate Thin Films.

Degree: PhD, Materials Science and Engineering, 2013, University of Florida

URL: http://ufdc.ufl.edu/UFE0045898

► Leadzirconate titanate (Pb(Zrx,Ti1-xO3, PZT) is awell-known piezoelectric and ferroelectric material. PZT in the form of thinfilms has current applications in capacitors, microsensors and microscalemechanical bugs.… (more)

▼ Leadzirconate titanate (Pb(Zrx,Ti1-xO3, PZT) is awell-known piezoelectric and ferroelectric material. PZT in the form of thinfilms has current applications in capacitors, microsensors and microscalemechanical bugs. For the preparation of PZT thin films, chemical solutiondeposition is one of the most utilized techniques due to the low cost andaccurate control of stoichiometry in the thin film. During chemical solutiondeposition, PZT precursor solutions are deposited onto a substrate using spincoating, and after pyrolysis, amorphous thin films are obtained. The amorphousthin films are crystallized by heating to a higher temperature. Intermediate PtxPband fluorite phases are commonly observed prior to the formation of perovskitePZT thin films during crystallization. In addition, depending on the differentprocessing conditions during crystallization such as the atmosphericconditions, heating rates and different substrates, different texture can beobtained in PZT thin films. However, the mechanism of texture control in PZTthin films is not well understood, because it is difficult to track the changesduring fast crystallization from amorphous to perovskite PZT within a fewseconds. Thus, in situ x-raydiffraction (XRD) measurements are useful to observe the phase and textureevolution of PZT thin films during crystallization. Inthis dissertation, in situmeasurements of PZT thin films using laboratory- and synchrotron based XRD wereconducted to investigate the phase and texture evolution duringcrystallization. The stability of intermediate phases and perovskite PZT wasobserved during crystallization in different atmospheric conditions. Based onthese observations, a novel processing method was developed. Switching atmospheric conditions during crystallization ofPZT thin films suppressed the intermetallic PtxPb phase and promotedthe perovskite PZT phase. Further,based on the observations of phase and texture evolution using differentheating rates and substrates during crystallization, a mechanism for texturecontrol of PZT thin films is provided. 111 texture was observed in PZT on 111Pt electrodes. It is suggested that 111 Pt nucleates 111PZT directly. Similar trends for the formation of 111 texture were observedin PZT on an amorphized PbTiO3 (PTO) seed layer, which implies thatnucleation of 111 texture occurred on a 111 Pt electrode. Conversely,dominant 100 texture was observed in PZT on amorphized PTO duringcrystallization at slow heating rates. It is suggested that surface orhomogeneous nucleation occurs at slow heating rates to promote 100texture in PTO layer at low temperature, and 100 textured PZT isnucleated from 100 texture of PTO layer at higher temperature. Also,interdiffusion between the PTO layer and the PZT layer during crystallizationled to the formation of PZT with an inhomogeneous composition throughout thethin films. Unlike PZT on amorphized PTO, dominant 100 texture was observedin PZT on crystalline PTO regardless of heating rates during crystallization.Also, the formation of the PZT thin films was observed… Advisors/Committee Members: Jones, Jacob L (committee chair), Phillpot, Simon R (committee member), Myers, Michele V (committee member), Perry, Scott S (committee member), Biswas, Amlan (committee member).

Subjects/Keywords: Crystallization; Electrodes; Fluorite; Heating; Nucleation; Parent teacher organizations; Perovskites; Pyrolysis; Thin films; Wave diffraction; crystallization – pzt – thinfilms – xrd

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APA (6^th Edition):

Mhin, S. W. (2013). Crystallization Behavior of Solution Deposited Lead Zirconate Titanate Thin Films. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0045898

Chicago Manual of Style (16^th Edition):

Mhin, Sung Wook. “Crystallization Behavior of Solution Deposited Lead Zirconate Titanate Thin Films.” 2013. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0045898.

MLA Handbook (7^th Edition):

Mhin, Sung Wook. “Crystallization Behavior of Solution Deposited Lead Zirconate Titanate Thin Films.” 2013. Web. 18 Oct 2019.

Vancouver:

Mhin SW. Crystallization Behavior of Solution Deposited Lead Zirconate Titanate Thin Films. [Internet] [Doctoral dissertation]. University of Florida; 2013. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0045898.

Council of Science Editors:

Mhin SW. Crystallization Behavior of Solution Deposited Lead Zirconate Titanate Thin Films. [Doctoral Dissertation]. University of Florida; 2013. Available from: http://ufdc.ufl.edu/UFE0045898

University of Florida

30. Chen, Yun-Wen. An Ab Initio Study of Alpha-Quartz (0001) Surface and Water-Silica Interface Interaction.

Degree: PhD, Physics, 2010, University of Florida

URL: http://ufdc.ufl.edu/UFE0042518

► Silica is an important mineral for many applications in our daily life. Thus, numerous studies have been done to understand its properties and its interaction… (more)

▼ Silica is an important mineral for many applications in our daily life. Thus, numerous studies have been done to understand its properties and its interaction with other materials/molecules. In this work, we apply first-principles density functional theory (DFT) calculations to the investigation of alpha-quartz (0001) surfaces and water clusters and water layer(s) adsorbed on those surfaces. Ten different surfaces are studied for exploring alpha-quartz (0001) surface properties. They include five reconstructed surfaces, one fully hydroxylated surface, and four defective surfaces. Water molecule(s) and layer(s) were deposited on seven of the surfaces to examine how surface character can affect the behavior of water molecule(s) or layer(s) adsorbed on the surface. A newly cleaved silica surface generally is thought to be hydroxylated quickly in atmosphere and become hydrophilic. However, the surface can be dehydrated under an Ultra High Vacuum (UHV) environment and the siloxane surface is then hydrophobic. We will discuss the five perfect surface reconstruction patterns of the alpha-quartz (0001) surface (called perfect surfaces frequently in the following text) and how they can explain the observed (2 x 2) diffraction spectrum in experiments. A fully hydroxylated alpha-quartz (0001) surface will be discussed in detail regarding its formation energy, structure and charge distribution. Two oxygen vacancy and two oxygen displacement defective surface patterns on (1 x 1) perfect surface were considered in this work. Their formation energies, structures, charge distributions and hydroxylation on the defect sites will be discussed. Water molecule adsorption on surfaces was investigated by depositing molecules one by one. The hydroxylated surface exhibits highly hydrophilic properties. Conversely, perfect surfaces are hydrophobic or interact with water molecules quite weakly. A defect on the surface does enhance water adsorption on that surface. However, the strong hydrogen bonds within a water cluster have a tendency to compromise the water-silica interaction. Ice XI sub-layers were deposited one by one on surfaces. The highly stable bilayer structures which result effectively shield the interaction between water and the silica surface. ( en ) Advisors/Committee Members: Cheng, Hai Ping (committee chair), Trickey, Samuel B. (committee member), Biswas, Amlan (committee member), Hirschfeld, Peter J. (committee member), Sinnott, Susan B. (committee member).

Subjects/Keywords: Adsorption; Atoms; Charge density; Hydrogen bonds; Molecules; Oxygen; Protons; Silicon; Surface water; Water tables; defect, dft, md, quartz, silica, surface, water

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APA (6^th Edition):

Chen, Y. (2010). An Ab Initio Study of Alpha-Quartz (0001) Surface and Water-Silica Interface Interaction. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0042518

Chicago Manual of Style (16^th Edition):

Chen, Yun-Wen. “An Ab Initio Study of Alpha-Quartz (0001) Surface and Water-Silica Interface Interaction.” 2010. Doctoral Dissertation, University of Florida. Accessed October 18, 2019. http://ufdc.ufl.edu/UFE0042518.

MLA Handbook (7^th Edition):

Chen, Yun-Wen. “An Ab Initio Study of Alpha-Quartz (0001) Surface and Water-Silica Interface Interaction.” 2010. Web. 18 Oct 2019.

Vancouver:

Chen Y. An Ab Initio Study of Alpha-Quartz (0001) Surface and Water-Silica Interface Interaction. [Internet] [Doctoral dissertation]. University of Florida; 2010. [cited 2019 Oct 18]. Available from: http://ufdc.ufl.edu/UFE0042518.

Council of Science Editors:

Chen Y. An Ab Initio Study of Alpha-Quartz (0001) Surface and Water-Silica Interface Interaction. [Doctoral Dissertation]. University of Florida; 2010. Available from: http://ufdc.ufl.edu/UFE0042518

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