subject:(Charge ordering)

NSYSU

1. Huang, Hui-Long. Interplay of charge and spin ordering in Pr0.65Ca0.35-xSrxMnO3.

Degree: Master, Physics, 2002, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0531102-112623

► The manganites of the type RMnO3 (R=La, Nd, Pr, Sm) are antiferromagnetic and the end (n= µ) members of the so-called Ruddlesden-Popper series, Rn+1MnnO3n+1. These… (more)

Subjects/Keywords: spin ordering; charge ordering; Pr

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APA (6^th Edition):

Huang, H. (2002). Interplay of charge and spin ordering in Pr0.65Ca0.35-xSrxMnO3. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0531102-112623

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Huang, Hui-Long. “Interplay of charge and spin ordering in Pr0.65Ca0.35-xSrxMnO3.” 2002. Thesis, NSYSU. Accessed January 24, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0531102-112623.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Huang, Hui-Long. “Interplay of charge and spin ordering in Pr0.65Ca0.35-xSrxMnO3.” 2002. Web. 24 Jan 2021.

Vancouver:

Huang H. Interplay of charge and spin ordering in Pr0.65Ca0.35-xSrxMnO3. [Internet] [Thesis]. NSYSU; 2002. [cited 2021 Jan 24]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0531102-112623.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Huang H. Interplay of charge and spin ordering in Pr0.65Ca0.35-xSrxMnO3. [Thesis]. NSYSU; 2002. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0531102-112623

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New South Wales

2. Chang, Fenfen. Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels.

Degree: Physics, 2017, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true

► Multiferroics exhibit tremendous potential in technological applications, of which the interplaybetween the ferro-/antiferromagnetic, ferroelectricity, and ferroelasticity can be manipulatedby external parameters such as electric or… (more)

▼ Multiferroics exhibit tremendous potential in technological applications, of which the interplaybetween the ferro-/antiferromagnetic, ferroelectricity, and ferroelasticity can be manipulatedby external parameters such as electric or magnetic fields and even can be created byproper control of internal parameters, such as oxygen-content, cation doping, and internalpressure. Invaluable insight into the multiferroicity can be provided by investigating the roleof such parameters in the crystallographic and magnetic structures of transition metal oxides.In this thesis, a comprehensive studies of contribution of oxygen-deficiencies and cation dopingto the various phases are presented, which utilize the neutron and synchrotron powderdiffraction.The multivalent nature of cobalt ions in SrCoO3􀀀d causes an oxygen-content dependentphase diagram. It is vital to determine the precise crystallographic and magnetic structure ofoxygen-vacancy ordered SrCoO3􀀀d , which provides prerequisite to reveal the mechanism ofits multiferroicity in the corresponding thin film samples. Using the neutron and synchrotronpowder diffraction techniques, the correct space group and precise magnetic structures aredetermined for the different oxygen-vacancy ordered phases: the brownmillerite SrCoO2:5,the tetragonal SrCoO2:875, and the cubic SrCoO3.Ferroelectricity can be induced by the canted spin configuration, which exists widely inthe frustrated spin systems. With such an expectation, Zn-substituted CuFe2O4 was studiedand a comprehensive phase diagram was built for Cu1􀀀xZnxFe2O4. Spin canting couldlead to a spin spiral phase which could possibly induce a multiferroic state as observed inCuFeO2. The purpose of this project was to further investigate the spin canting in ZndopedCuFe2O4 and elucidate the possibility of multiferroicity in this system. Furthermore,pure ZnFe2O4 is already an interesting highly frustrated spin system. Magnetite is the oldestknown magnet. As the first known multiferroics, the ferroelectricity in Fe3O4 is drivenby the Verwey transition. However, the microscopic origin of the Verwey transition in Fe3O4is still in debate. In order to obtain a deeper insight into the mechanism of the charge ordering,Cu-doped Fe3O4 was investigated using the high-resolution neutron and synchrotrondiffraction. The main emphasis was the stability of the Verwey transition with charge carrierdoping. Advisors/Committee Members: Ulrich, Clemens, Physics, Faculty of Science, UNSW, Sushkov, Oleg, Physics, Faculty of Science, UNSW.

Subjects/Keywords: Oxygen vacancy ordering; Neutron diffraction; Synchrotron powder diffraction; Verwey transition; Charge ordering

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APA (6^th Edition):

Chang, F. (2017). Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Chang, Fenfen. “Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels.” 2017. Doctoral Dissertation, University of New South Wales. Accessed January 24, 2021. http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Chang, Fenfen. “Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels.” 2017. Web. 24 Jan 2021.

Vancouver:

Chang F. Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Jan 24]. Available from: http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true.

Council of Science Editors:

Chang F. Search for novel multifunctional materials: a comprehensive neutron and synchrotron diffraction study on cobaltates and spinels. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/57563 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:43656/SOURCE02?view=true

University of Illinois – Chicago

3. Cheng, Jian-Yih. Fundamental Research On Direct Fabrication Of Low Dimensional Nanomaterials On Si Substrates.

Degree: 2017, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/21945

► Continuous demand for improvements to reduced electronic sizes, increased processor density, and faster performance of electronics have led researchers to study low dimensional nanomaterials for… (more)

▼ Continuous demand for improvements to reduced electronic sizes, increased processor density, and faster performance of electronics have led researchers to study low dimensional nanomaterials for their electrical properties and sizes to achieve these criteria. These specific examples of low dimensional structures are of particular interest in electronics applications due to their size and electrical properties as they display unique electrical characteristics suitable for electronics applications. In particular, Ni and Cu silicides have a long history in Si based electronics as contact materials and interconnects in CMOS technology. Recently silicides have been used to grow large scale, high quality graphene flakes and have been shown to protect a silicide layer from oxidation. However, previous research of graphene growth atop silicides has only occurred using metal substrates in the graphene growth, followed by silicidation after the graphene has been grown. This dissertation looks at the theoretical and experimental studies of graphene and other low dimensional layers on Si. DFT calculations were performed to study whether two dimensional layers such as graphene and silicene are stable atop silicides. The binding energy, band structure, and density of states were calculated and these calculations were used to study how the silicide interface may affect the electrical properties of the 2D layer on top. Exploratory research on the direct fabrication of graphene on Si using silicides is presented as a proof of concept experiment to directly integrate graphene on Si substrates without the transfer method. Additionally, quantum dot behavior of self-assembled Ni-Si quantum dots was studied on Si(111). Ni-Si QD structures on Si(111) form ring like structures similar to the √19×√19 reconstruction. Using scanning tunneling microscopy (STM), the electronic properties of these Ni-Si rings were studied and found to display negative differential resistance (NDR) and quantum resonance not previously observed. Finally, low temperature (55K) STM analysis of low dimensional Sn layers on Si(111) were shown not to form a silicide due to the low solubility between Sn and Si. This new phase is of interest due to conductance and topology images indicating charge ordering within a new 4√3x2√3 phase indicating the possibility of a charge density wave at lower temperatures providing further evidence towards Sn monolayers of Si acting as a topological insulator. Advisors/Committee Members: Lilley, Carmen M (advisor), Salehi, Amin (committee member), Megaridis, Constantine (committee member), Guisinger, Nathan (committee member), Chan, Maria (committee member), Lilley, Carmen M (chair).

Subjects/Keywords: Graphene; silicides; low-dimension nanostructures; quantum dots; charge density; silicene; band gap; charge ordering

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APA (6^th Edition):

Cheng, J. (2017). Fundamental Research On Direct Fabrication Of Low Dimensional Nanomaterials On Si Substrates. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/21945

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cheng, Jian-Yih. “Fundamental Research On Direct Fabrication Of Low Dimensional Nanomaterials On Si Substrates.” 2017. Thesis, University of Illinois – Chicago. Accessed January 24, 2021. http://hdl.handle.net/10027/21945.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cheng, Jian-Yih. “Fundamental Research On Direct Fabrication Of Low Dimensional Nanomaterials On Si Substrates.” 2017. Web. 24 Jan 2021.

Vancouver:

Cheng J. Fundamental Research On Direct Fabrication Of Low Dimensional Nanomaterials On Si Substrates. [Internet] [Thesis]. University of Illinois – Chicago; 2017. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10027/21945.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cheng J. Fundamental Research On Direct Fabrication Of Low Dimensional Nanomaterials On Si Substrates. [Thesis]. University of Illinois – Chicago; 2017. Available from: http://hdl.handle.net/10027/21945

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Houston

4. Ahmadi Vaselabadi, Saeed. Tuning functionality of printed conductive polymers using proximity ion beam lithograthy.

Degree: MS, Chemical Engineering, 2014, University of Houston

URL: http://hdl.handle.net/10657/1406

► Polymer semiconductors are used in low-cost electronics such as plastic solar cells, thin film transistors, and light-emitting diodes. Their performance in these devices is partly… (more)

Subjects/Keywords: Polymer semiconductors; Proximity ion beam lithography; P3HT; Charge mobility; Molecular ordering

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APA (6^th Edition):

Ahmadi Vaselabadi, S. (2014). Tuning functionality of printed conductive polymers using proximity ion beam lithograthy. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1406

Chicago Manual of Style (16^th Edition):

Ahmadi Vaselabadi, Saeed. “Tuning functionality of printed conductive polymers using proximity ion beam lithograthy.” 2014. Masters Thesis, University of Houston. Accessed January 24, 2021. http://hdl.handle.net/10657/1406.

MLA Handbook (7^th Edition):

Ahmadi Vaselabadi, Saeed. “Tuning functionality of printed conductive polymers using proximity ion beam lithograthy.” 2014. Web. 24 Jan 2021.

Vancouver:

Ahmadi Vaselabadi S. Tuning functionality of printed conductive polymers using proximity ion beam lithograthy. [Internet] [Masters thesis]. University of Houston; 2014. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10657/1406.

Council of Science Editors:

Ahmadi Vaselabadi S. Tuning functionality of printed conductive polymers using proximity ion beam lithograthy. [Masters Thesis]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1406

5. Février, Clément. Nouvelles phases électroniques avec orbitales eg dans les réseaux triangulaires : Novel electronic phases with eg orbitals in triangular lattices.

Degree: Docteur es, Physique théorique, 2016, Université Grenoble Alpes (ComUE)

URL: http://www.theses.fr/2016GREAY012

► Les composés en couches avec des ions métaux de transition ont leur bande de conduction dans les orbitales d. On se concentrera dans cette thèse… (more)

▼ Les composés en couches avec des ions métaux de transition ont leur bande de conduction dans les orbitales d. On se concentrera dans cette thèse sur les systèmes où le champs cristallin sépare les orbitales en deux sets dégénérés, t2g et eg, où les électrons de conduction sont sur les orbitales eg. C'est le cas pour les dichalcogénures en couches à métaux de transitions et 2H-AgNiO2 qui sont connus pour présenter des ordres de charge, un arrangement périodique des électrons sur le réseau. Les dichalcogénures en couches à métaux de transitions ont divers motifs, des ordres des charge commensurables et incommensurables, parmi eux, des ordres de charge à grande maille unité,comme le motif √13x√13 en étoile de David. 2H-AgNiO2 a un ordre de charge triple mais reste métallique.Dans le but de comprendre leurs ordres de charge, nous avons établi un modèle de Hubbard étendu multibandes et nous avons recentré notre intérêt sur les orbitales eg avec fortes interactions coulombiennes locales. À l'aide d'une approche en liaison forte et de considérations électrostatiques, puis grâce à la méthode de Hartree-Fock non restreinte, nous avons construit le diagramme de phases en fonction de la force des interactions coulombiennes, aussi bien locale qu'à courte portée, et nous avons fait évoluer la structure de bande en utilisant le ratio libre t'/t qui décrit la structure de bande dans les matériaux ayant des orbitales eg. Nous avons révélé un diagramme de phase riche avec plus de dix phases où certaines transitions peuvent être contrôlées par la structure de bande. En particulier, nous avons trouvé des phases pinball liquid, un ordre de charge métallique à trois sites par maille unité, où des charges localisées (pins) sont entourées de charges itinérantes (balls) sur un réseau hexagonal. Des ordres de charges à grande maille unité sont aussi stabilisés, tels que des ordres de charge et d'orbitale incommensurables et un ordre de charge √12x√12, qui rappelle le motif √13x√13 en étoile de David présent dans 1T-TaS2. Ces états électroniques s'avèrent génériques pour le réseau triangulaire demi rempli et sont aussi trouvés dans le cas isotrope, qui correspond au modèle de Hubbard étendu à une bande.Cependant, la méthode de Hartree-Fock non restreinte est problématique pou saisir les propriétés des phases lors d'une forte anisotropie de la structure de bande pour les états de Mott. Pour résoudre ce problème, nous avons établi un hamiltonien type Heisenberg à partir d'une théorie de perturbation. Ensuite, nous avons établit le diagramme de phases de ce nouvel hamiltonien en utilisant une approche classique et la diagonalisation exacte avec une analyse de symétries et l'algorithme de Lanczos pour un système de 24 sites. Mis à part les phases connues du modèle de Heisenberg en présence d'un champ magnétique, les configuration Y et V, le plateau 1/3, la phase ferro-orbitale, l'anisotropie de la structure de bande des orbitales eg conduit à d'autres ordres avec une composante τy ou τx et τz finies, différents ordres en bande et des ondes de… Advisors/Committee Members: Fratini, Simone (thesis director), Ralko, Arnaud (thesis director).

Subjects/Keywords: Transitions de phase; Ordre de charge; Point critique quantique; Frustration; Orbitales; Phase transition; Charge ordering; Quantum Critical Point; Frustration; Orbitals; 530

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APA (6^th Edition):

Février, C. (2016). Nouvelles phases électroniques avec orbitales eg dans les réseaux triangulaires : Novel electronic phases with eg orbitals in triangular lattices. (Doctoral Dissertation). Université Grenoble Alpes (ComUE). Retrieved from http://www.theses.fr/2016GREAY012

Chicago Manual of Style (16^th Edition):

Février, Clément. “Nouvelles phases électroniques avec orbitales eg dans les réseaux triangulaires : Novel electronic phases with eg orbitals in triangular lattices.” 2016. Doctoral Dissertation, Université Grenoble Alpes (ComUE). Accessed January 24, 2021. http://www.theses.fr/2016GREAY012.

MLA Handbook (7^th Edition):

Février, Clément. “Nouvelles phases électroniques avec orbitales eg dans les réseaux triangulaires : Novel electronic phases with eg orbitals in triangular lattices.” 2016. Web. 24 Jan 2021.

Vancouver:

Février C. Nouvelles phases électroniques avec orbitales eg dans les réseaux triangulaires : Novel electronic phases with eg orbitals in triangular lattices. [Internet] [Doctoral dissertation]. Université Grenoble Alpes (ComUE); 2016. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2016GREAY012.

Council of Science Editors:

Février C. Nouvelles phases électroniques avec orbitales eg dans les réseaux triangulaires : Novel electronic phases with eg orbitals in triangular lattices. [Doctoral Dissertation]. Université Grenoble Alpes (ComUE); 2016. Available from: http://www.theses.fr/2016GREAY012

6. Senn, Mark Stephen. Charge, orbital and magnetic ordering in transition metal oxides.

Degree: PhD, 2013, University of Edinburgh

URL: http://hdl.handle.net/1842/7828

► Neutron and x-ray diffraction has been used to study charge, orbital and magnetic ordering in some transition metal oxides. The long standing controversy regarding the… (more)

▼ Neutron and x-ray diffraction has been used to study charge, orbital and magnetic ordering in some transition metal oxides. The long standing controversy regarding the nature of the ground state (Verwey structure) of the canonical charge ordered material magnetite (Fe3O4) has been resolved by x-ray single crystal diffraction studies on an almost single domain sample at 90 K. The Verwey structure is confirmed to have Cc symmetry with 56 unique sites in the asymmetric unit. Charge ordering is shown to be a useful first approximation to describe the nature of the ground state, and the conjecture that Verwey made in 1939 has finally been confirmed. However, three-site distortions which couple to the orbital ordering of the Fe2+ ordered states (trimerons) are shown to provide a more complete description of the low temperature structure. Trimerons explain the rather continuous distribution of the valence states observed in magnetite below Tv, anomalous shortening of Fe-Fe distances and the off-centre distortions resulting in ferroelectricity. DFT+U electronic structure calculations on the experimental coordinates support the conclusion of this crystallographic study, with the highest electron densities calculated for those Fe-Fe distances predicated to participate in the trimeron bonds. The 6H-perovskites of the type Ba3ARu2O9 have been reinvestigated by high resolution neutron and x-ray power diffraction. The charge ordered state of Ba3NaRu2O9 has been characterised at 110 K (P2/c, a =5.84001(2) Å, b = 10.22197(4) Å, c = 14.48497(6) Å, β = 90.2627(3) °) and shown to consist of a structure with near integer charge ordering of Ru5+ 2O9 / Ru6+ 2O9 dimers. The ground state has been shown to be very sensitive to external perturbations, with a novel melting of charge ordering observed under x-ray irradiation below 40 K (C2/c, a =5.84470(2) Å, b = 10.17706(3) Å, c = 14.45866(5) Å, β = 90.2151(3)-° at 10 K). High pressure studies reveal that the Ru-Ru intra-dimer distance may dictate the response of the system to pressure. Empirical trends in the Ba3ARu2O9 series of compounds have shown that change in ‘chemical pressure’ in these systems may be rationalised in terms of Coulomb’s law. In A = La and Y the magnetic ordering is shown to be FM within the Ru2O9 dimers (1.4(2) μB and 0.5(1) μB, respectively per Ru), representing the first case of intra dimer FM coupling reported in a system containing face-sharing RuO6 octahedra . The overall AFM coupling of the dimers implies an as yet unobserved breaking of the parent symmetry. In A = Nd, a complex competition between the crystal field effect of Nd3+ and the magnetic ordering of the Ru2O9 FM moments has been observed, leading first vi to FM order of Nd at 25 K (1.56(7) μB) followed by ordering of Ru moments (0.5(1) μB) and a spin reorientation transition of Nd moments at 18 K. In A = Ca, the formation of a singlet ground state is observed in Ru2O9 rather than the expected AFM coupling and below 100 K Ba3CaRu2O9 is diamagnetic. All five systems indicate that the Ru2O9 dimer is the…

Subjects/Keywords: 661; transition metal oxides; Charge ordering; Verwey structure; orbital ordering; trimerons

…structural trends and the ordering of charge, spin and orbital degrees of freedom. vi Table of… …1 1.1.1. Charge Ordering… …Charge ordering transitions in Ba3NaRu2O9… …117 6.2. Charge ordering transition at 210 K… …Charge ordering DBB – Distance between two B-sites D(Ru-Ru) – Distance between two Ru…

10 more images…

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APA (6^th Edition):

Senn, M. S. (2013). Charge, orbital and magnetic ordering in transition metal oxides. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/7828

Chicago Manual of Style (16^th Edition):

Senn, Mark Stephen. “Charge, orbital and magnetic ordering in transition metal oxides.” 2013. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/7828.

MLA Handbook (7^th Edition):

Senn, Mark Stephen. “Charge, orbital and magnetic ordering in transition metal oxides.” 2013. Web. 24 Jan 2021.

Vancouver:

Senn MS. Charge, orbital and magnetic ordering in transition metal oxides. [Internet] [Doctoral dissertation]. University of Edinburgh; 2013. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/7828.

Council of Science Editors:

Senn MS. Charge, orbital and magnetic ordering in transition metal oxides. [Doctoral Dissertation]. University of Edinburgh; 2013. Available from: http://hdl.handle.net/1842/7828

Iowa State University

7. Ma, Jie. Neutron Scattering Study of Charge-Ordering in R_1/3Sr_2/3FeO₃(R=La, Pr, Nd, Sm, and Y).

Degree: 2010, Iowa State University

URL: https://lib.dr.iastate.edu/etd/11490

► The series of compounds R1/3Sr2/3FeO3 (R = La, Pr, Nd, and Sm) undergo a Verwey transition along with an antiferromagnetic ordering of Fe spins as… (more)

Subjects/Keywords: Charge Ordering; magnetic energy; Neutron scattering; Perovskite; Rare Earth; Transition metal oxide; Physics

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APA (6^th Edition):

Ma, J. (2010). Neutron Scattering Study of Charge-Ordering in R_1/3Sr_2/3FeO₃(R=La, Pr, Nd, Sm, and Y). (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/11490

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ma, Jie. “Neutron Scattering Study of Charge-Ordering in R_1/3Sr_2/3FeO₃(R=La, Pr, Nd, Sm, and Y).” 2010. Thesis, Iowa State University. Accessed January 24, 2021. https://lib.dr.iastate.edu/etd/11490.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ma, Jie. “Neutron Scattering Study of Charge-Ordering in R_1/3Sr_2/3FeO₃(R=La, Pr, Nd, Sm, and Y).” 2010. Web. 24 Jan 2021.

Vancouver:

Ma J. Neutron Scattering Study of Charge-Ordering in R_1/3Sr_2/3FeO₃(R=La, Pr, Nd, Sm, and Y). [Internet] [Thesis]. Iowa State University; 2010. [cited 2021 Jan 24]. Available from: https://lib.dr.iastate.edu/etd/11490.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ma J. Neutron Scattering Study of Charge-Ordering in R_1/3Sr_2/3FeO₃(R=La, Pr, Nd, Sm, and Y). [Thesis]. Iowa State University; 2010. Available from: https://lib.dr.iastate.edu/etd/11490

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

8. VANDRANGI SURESH KUMAR. Electrical, magnetic and magnetocaloric properties of selected b-site substituted manganites.

Degree: 2012, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/37589

Subjects/Keywords: Manganites; charge ordering; magnetism; electrical transport; Mn-site substitution; magnetocaloric effect

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APA (6^th Edition):

KUMAR, V. S. (2012). Electrical, magnetic and magnetocaloric properties of selected b-site substituted manganites. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/37589

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

KUMAR, VANDRANGI SURESH. “Electrical, magnetic and magnetocaloric properties of selected b-site substituted manganites.” 2012. Thesis, National University of Singapore. Accessed January 24, 2021. http://scholarbank.nus.edu.sg/handle/10635/37589.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

KUMAR, VANDRANGI SURESH. “Electrical, magnetic and magnetocaloric properties of selected b-site substituted manganites.” 2012. Web. 24 Jan 2021.

Vancouver:

KUMAR VS. Electrical, magnetic and magnetocaloric properties of selected b-site substituted manganites. [Internet] [Thesis]. National University of Singapore; 2012. [cited 2021 Jan 24]. Available from: http://scholarbank.nus.edu.sg/handle/10635/37589.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

KUMAR VS. Electrical, magnetic and magnetocaloric properties of selected b-site substituted manganites. [Thesis]. National University of Singapore; 2012. Available from: http://scholarbank.nus.edu.sg/handle/10635/37589

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

9. Dutta, Rajesh. Etude in situ, par diffraction des rayons X et diffusion neutronique sur monocristaux, de la complexité structurale de l'oxyde fortement corrélé Pr2-xSrxNiO4+δ : Structural complexity in strongly correlated Pr2-xSrxNiO4+δ, explored by in situ single crystal X-ray and neutron diffraction.

Degree: Docteur es, Physico-Chimie de la Matière Condensée, 2017, Bordeaux

URL: http://www.theses.fr/2017BORD0754

►

Les oxydes non-stoechiométriques de type Ruddlesden-Popper, tel que Pr2NiO4+δ, peuvent être dopés en trous par substitution du strontium au praséodyme ou par insertion d’oxygène. Ces… (more)

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Les oxydes non-stoechiométriques de type Ruddlesden-Popper, tel que Pr2NiO4+δ, peuvent être dopés en trous par substitution du strontium au praséodyme ou par insertion d’oxygène. Ces modes de dopage s’accompagnent de mises en ordre complexes impliquant la distribution des ions oxygène excédentaires, des ordres de charge et/ou de spin. Le diagramme de phase de Pr2-xSrxNiO4+δ a été exploré par diffraction des rayons X (en laboratoire et par rayonnement synchrotron) ainsi que neutronique. Pour la phase Pr2NiO4.25, nous avons mis en évidence une sur-structure incommensurable avec des réflexions satellites au 6ème ordre, produisant un spectre de diffraction très complexe avec 4 individus et 8 domaines incommensurables. Par diffractions synchrotron et neutronique, un ordre de charge de type échiquier a été identifié dès la température ambiante, suivi en dessous de 170 K par un ordre de type rubans ; un ordre de spin incommensurable s’établit au-dessous de 99 K. Ce travail a permis de révéler un ensemble complexe de phases ordonnées structuralement et électroniquement, gouvernées par des variations subtiles de stoechiométrie en strontium et oxygène.

Non-stoichiometric oxides from the Ruddlesden-Popper series, such as Pr2NiO4+δ, can be hole-doped by substituting strontium to praseodymium or by oxygen insertion. This leads to complex structural ordering involving oxygen-, charge- and spin ordering. The complex phase diagram of Pr2-xSrxNiO4+δ was explored using X-ray (laboratory and synchrotron) as well as neutron diffractions. For the doped phase of highest oxygen content (Pr2NiO4.25), we could evidence an incommensurate structure with satellite reflections of 6th order, yielding a very complex diffraction pattern of up to four twin-individuals and eight incommensurate domains. Checkerboard-type charge ordering was identified already at ambient temperature, while stripe charge ordering was observed below 170 K by synchrotron and neutron diffraction; incommensurate spin ordering appears below 99 K. This thesis reveals the existence of many complex oxygen and electronically ordered phases going along with small variations of the oxygen/strontium stoichiometry.

Advisors/Committee Members: Villesuzanne, Antoine (thesis director), Paulus, Werner (thesis director).

Subjects/Keywords: Oxides fortment corrélés; Dopage par trou; Structures modules; Ordre de charge-spin; Oxides non-stoechiometriques; Mobilite de l'oxygene; Strongly correlated electron system; Hole doping; Modulated structure; Charge-spin ordering; Non-stoichiometric oxides; Oxygen mobility; 541.042

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

APA (6^th Edition):

Dutta, R. (2017). Etude in situ, par diffraction des rayons X et diffusion neutronique sur monocristaux, de la complexité structurale de l'oxyde fortement corrélé Pr2-xSrxNiO4+δ : Structural complexity in strongly correlated Pr2-xSrxNiO4+δ, explored by in situ single crystal X-ray and neutron diffraction. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2017BORD0754

Chicago Manual of Style (16^th Edition):

Dutta, Rajesh. “Etude in situ, par diffraction des rayons X et diffusion neutronique sur monocristaux, de la complexité structurale de l'oxyde fortement corrélé Pr2-xSrxNiO4+δ : Structural complexity in strongly correlated Pr2-xSrxNiO4+δ, explored by in situ single crystal X-ray and neutron diffraction.” 2017. Doctoral Dissertation, Bordeaux. Accessed January 24, 2021. http://www.theses.fr/2017BORD0754.

MLA Handbook (7^th Edition):

Dutta, Rajesh. “Etude in situ, par diffraction des rayons X et diffusion neutronique sur monocristaux, de la complexité structurale de l'oxyde fortement corrélé Pr2-xSrxNiO4+δ : Structural complexity in strongly correlated Pr2-xSrxNiO4+δ, explored by in situ single crystal X-ray and neutron diffraction.” 2017. Web. 24 Jan 2021.

Vancouver:

Dutta R. Etude in situ, par diffraction des rayons X et diffusion neutronique sur monocristaux, de la complexité structurale de l'oxyde fortement corrélé Pr2-xSrxNiO4+δ : Structural complexity in strongly correlated Pr2-xSrxNiO4+δ, explored by in situ single crystal X-ray and neutron diffraction. [Internet] [Doctoral dissertation]. Bordeaux; 2017. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2017BORD0754.

Council of Science Editors:

Dutta R. Etude in situ, par diffraction des rayons X et diffusion neutronique sur monocristaux, de la complexité structurale de l'oxyde fortement corrélé Pr2-xSrxNiO4+δ : Structural complexity in strongly correlated Pr2-xSrxNiO4+δ, explored by in situ single crystal X-ray and neutron diffraction. [Doctoral Dissertation]. Bordeaux; 2017. Available from: http://www.theses.fr/2017BORD0754

10. Wang, Hsin-Hua. NMR Study on a Quarter-Filled Organic Superconductor – Charge Ordering, Superconductivity, and the FFLO state in a Layered Superconductor.

Degree: Materials Science and Engineering, 2018, UCLA

URL: http://www.escholarship.org/uc/item/60w3s4hc

► Due to the low dimensionality of molecular conductors, they are categorized into a class of materials with strong electron correlation, namely Coulomb repulsion. The pairing… (more)

Subjects/Keywords: Condensed matter physics; Materials Science; charge fluctuation; charge ordering; FFLO state; NMR; unconventional superconductivity

…Charge ordering and superconductivity arising from electron correlation in a quarter-filled… …25 4 Result I - Charge Ordering and Superconductivity . . . . . . . . . . . . . 28 4.1… …condensed matter physics. The topics covered in this dissertation include charge ordering in a… …of charge ordering and charge fluctuation in underdoped cuprates, which has triggered… …remains a promising conjecture regarding the pairing mechanisms. 1.1.2 Charge ordering and…

12 more images…

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APA (6^th Edition):

Wang, H. (2018). NMR Study on a Quarter-Filled Organic Superconductor – Charge Ordering, Superconductivity, and the FFLO state in a Layered Superconductor. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/60w3s4hc

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Hsin-Hua. “NMR Study on a Quarter-Filled Organic Superconductor – Charge Ordering, Superconductivity, and the FFLO state in a Layered Superconductor.” 2018. Thesis, UCLA. Accessed January 24, 2021. http://www.escholarship.org/uc/item/60w3s4hc.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Hsin-Hua. “NMR Study on a Quarter-Filled Organic Superconductor – Charge Ordering, Superconductivity, and the FFLO state in a Layered Superconductor.” 2018. Web. 24 Jan 2021.

Vancouver:

Wang H. NMR Study on a Quarter-Filled Organic Superconductor – Charge Ordering, Superconductivity, and the FFLO state in a Layered Superconductor. [Internet] [Thesis]. UCLA; 2018. [cited 2021 Jan 24]. Available from: http://www.escholarship.org/uc/item/60w3s4hc.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang H. NMR Study on a Quarter-Filled Organic Superconductor – Charge Ordering, Superconductivity, and the FFLO state in a Layered Superconductor. [Thesis]. UCLA; 2018. Available from: http://www.escholarship.org/uc/item/60w3s4hc

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Université Paris-Sud – Paris XI

11. Bernu, Sylvain. Etude structurale sous pression de BaVS3, un composé quasi-1D à électrons corrélés, et effets des substitutions chimiques : Structural study under pressure of the quasi 1D correlated electronic coumpond BaVS3, and effect of chemical substitutions.

Degree: Docteur es, Physique de la matière condensée, 2011, Université Paris-Sud – Paris XI

URL: http://www.theses.fr/2011PA112173

►

BaVS3 est un système quasi-unidimensionnel constitué de chaînes de vanadium. C'est aussi un système multi-bandes dans lequel plusieurs types d'électrons coexistent au voisinage du niveau… (more)

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BaVS3 est un système quasi-unidimensionnel constitué de chaînes de vanadium. C'est aussi un système multi-bandes dans lequel plusieurs types d'électrons coexistent au voisinage du niveau de Fermi (les bandes dz2 et e(t2g)), qui sont fortement corrélés. Ce système s'appuie donc à la fois sur la physiques des systèmes unidimensionnels et sur celle des systèmes à électrons fortement corrélés. La transition métal-isolant de BaVS3, qui fut l'objet de nombreuses études, a récemment été interprété comme s'apparentant à une onde de densité de charge des électrons dz2 : celle-ci s'accompagne d'une quadrimérisation de la chaîne de vanadium et de l'apparition d'une sur-structure indexée (1,0,1/2)O dans le réseau réciproque. La composante commensurable de la sur-structure selon l'axe des chaînes ne peut s'expliquer qu'en considérant une redistribution des électrons entre les différentes bandes au voisinage du niveau de Fermi sous l'effet des corrélations électroniques. La transition métal-isolant disparaît en un point critique quantique sous pression à 2 GPa. D'un autre point de vu, une autre instabilité isolante d'un autre type, indexée (1/3,1/3,0.8)H avait été observée dans des échantillons substitués chimiquement. Cette thèse en deux temps s'est d'abord intéressée à la compétition entre les deux phases (1,0,1/2)O et (1/3,1/3,0.8)H dans deux séries d'échantillons chimiquement modifié BaVS3-δ et Ba1-xSrxVS3. Cette étude permet de montrer que la phase (1/3,1/3,0.8)H est associée à un ordre de charge des électrons e(t2g) et de conclure sur le rôle des modifications chimiques en temps qu'impuretés quand au mécanisme d'apparition de la seconde phase, par opposition à une théorie de "pression chimique". Le deuxième temps de cette thèse présente l'étude structurale de la transition métal-isolant sous pression. Cette étude à nécessité la mise en place d'un dispositif de diffraction sous pression à basse température avec mesure in-situ de la pression. Cette étude a montrée que la modulation structurale reste commensurable sur les 3/4 du diagramme de phase puis devient incommensurable lorsque l'on s'approche du point critique quantique. Ceci permet d'interpréter l'évolution de la transition métal-isolant sous pression en terme de locking à la commensurabilité, et donne une information sur la physique du composé au voisinage du point critique quantique.

BaVS3 is a quasi one dimensional system made of vanadium chains. It is also a multi-band system in which different kinds of electrons coexist near the Fermi level (the dz2 and e(t2g) bands), which are strongly correlated. This system belongs thus either to the one dimensional physics and to the strongly correlated electron physics. The metal - insulator transition in BaVS3, which has been extensively studied, was recently interpreted relying on a Peierls-like theory for the dz2 band : the transition involves a quadrimerisation of the vanadium chain, which corresponds to a super-structure indexed (1,0,1/2)O in the reciprocal lattice. This commensurate indexation can only be explained by…

Advisors/Committee Members: Foury-Leylekian, Pascale (thesis director).

Subjects/Keywords: Systèmes unidimensionnels; Électrons corrélés; Ondes de densité de charges; Ordres de charges; Diffraction rayon X; Pression; BaVS3; One dimensionnal systems; Correlated electrons; Charge density waves; Charge ordering; X-ray diffraction; Pressure; BaVS3

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

APA (6^th Edition):

Bernu, S. (2011). Etude structurale sous pression de BaVS3, un composé quasi-1D à électrons corrélés, et effets des substitutions chimiques : Structural study under pressure of the quasi 1D correlated electronic coumpond BaVS3, and effect of chemical substitutions. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2011PA112173

Chicago Manual of Style (16^th Edition):

Bernu, Sylvain. “Etude structurale sous pression de BaVS3, un composé quasi-1D à électrons corrélés, et effets des substitutions chimiques : Structural study under pressure of the quasi 1D correlated electronic coumpond BaVS3, and effect of chemical substitutions.” 2011. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed January 24, 2021. http://www.theses.fr/2011PA112173.

MLA Handbook (7^th Edition):

Bernu, Sylvain. “Etude structurale sous pression de BaVS3, un composé quasi-1D à électrons corrélés, et effets des substitutions chimiques : Structural study under pressure of the quasi 1D correlated electronic coumpond BaVS3, and effect of chemical substitutions.” 2011. Web. 24 Jan 2021.

Vancouver:

Bernu S. Etude structurale sous pression de BaVS3, un composé quasi-1D à électrons corrélés, et effets des substitutions chimiques : Structural study under pressure of the quasi 1D correlated electronic coumpond BaVS3, and effect of chemical substitutions. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2011. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2011PA112173.

Council of Science Editors:

Bernu S. Etude structurale sous pression de BaVS3, un composé quasi-1D à électrons corrélés, et effets des substitutions chimiques : Structural study under pressure of the quasi 1D correlated electronic coumpond BaVS3, and effect of chemical substitutions. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2011. Available from: http://www.theses.fr/2011PA112173

12. Κουμούλης, Δημήτριος. Φασματοσκοπικές μελέτες πυρηνικού μαγνητικού συντονισμού (NMR) σε οξείδια μετάλλων μετάπτωσης ισχυρής ηλεκτρονικής συσχέτισης με ενδογεν...

Degree: 2011, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/26144

►

The present dissertation advanced the knowledge of the role of stripes in the electronic and magnetotransport properties of hole-doped transition metal oxide (TMO) compounds, such… (more)

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The present dissertation advanced the knowledge of the role of stripes in the electronic and magnetotransport properties of hole-doped transition metal oxide (TMO) compounds, such as high Tc cuprates, nickelates and manganites which still remains a central issue in the physics of strongly correlated electron systems. In this research by using X-ray diffraction measurements (XRD), magnetisation measurements (SQUID, PPMS), specific heat measurements (PPMS) and Nuclear Magnetic Resonance experiments (0, 2.35, 4.7, 9.4 Tesla), we provide direct evidence that the spin ground state in La based overdoped manganites is IC modulated with phase solitons. At higher temperatures the solitonic superstructure is replaced by a uniform spin density wave, subjected to coherent slow fluctuations, which show a striking similarity with slow fluctuations in the striped phase of high Tc cuprates and nickelates. This is a completely new result, which urges us to reconsider the worldwide dominant opinions about the low temperature electronic properties of overdoped manganites. Even more, the fundamental mechanism governing the establishment and evolution of the stripe phase appears to be common in overdoped manganites with cuprates and nickelates.

Η παρoύσα διατριβή, προήγαγε την γνώση γύρω από το ρόλο των λωρίδων (stripes) φορτίου στις ηλεκτρονικές και μαγνητικές ιδιότητες των νοθευμένων με οπές οξειδίων των μετάλλων μετάβασης, γεγονός που αποτελεί θεμελιακό πρόβλημα στην κατανόηση της βασικής κατάστασης των περοβσκιτών μαγγανίου και των υπεραγωγών υψηλής θερμοκρασίας. Η παρούσα έρευνα αποκάλυψε από πειραματικά αποτελέσματα μέσω περίθλασης ακτίνων Χ (XRD), μετρήσεις ειδικής θερμότητας (διάταξη μετρήσεων φυσικών ιδιοτήτων PPMS), μαγνητικές μετρήσεις (διάταξη υπεραγώγιμης κβαντικής συμβολής SQUID και διάταξη μετρήσεων φυσικών ιδιοτήτων) και φασματοσκοπικές μελέτες Πυρηνικού Μαγνητικού Συντονισμού συναρτήσει του ποσοστού νόθευσης, της θερμοκρασίας και του εξωτερικά επιβαλλόμενου μαγνητικού πεδίου (0, 2.35, 4.7, 9.4 Τesla) ότι η βασική κατάσταση σπιν των υπερνοθευμένων μαγγανιτών Λανθανίου, είναι διαμορφωμένη από ένα σολιτονικό κύμα φορτίου και σπιν (IC-SDW). Με την αύξηση της θερμοκρασίας η σολιτονική υπερδομή δίνει την θέση της σε ένα ομοιόμορφο ασύμμετρο κύμα πυκνότητας σπιν το οποίο υφίσταται αργές συλλογικές θερμοκρασιακές διακυμάνσεις παρόμοιες με αυτές που παρουσιάζονται στην φάση λωρίδων φορτίου των υπεραγωγών υψηλών θερμοκρασιών Cu και Ni. Αυτό είναι ένα νέο αποτέλεσμα, το οποίο επαναπροσδιορίζει τις μέχρι σήμερα επικρατούσες απόψεις για τον τρόπο διευθέτησης των φορτίων και σπιν στην βασική κατάσταση τόσο των περοβσκιτών μαγγανίου όσο και των υπεραγωγών χαλκού και νικελίου.

Subjects/Keywords: Τάξη ηλεκτρικού φορτίου; Περοβσκίτες μαγγανίου; Μαγνητικά σολιτόνια; 2D Πυρηνικός μαγνητικός συντονισμός; Εξαφάνιση σήματος NMR; Υπεραγωγός; Φυσική συστημάτων ισχυρής ηλεκτρονικής συσχέτισης; Ασύμμετρο κύμα πυκνότητας φορτίου και σπιν; Charge ordering; Manganites; Magnetic solitons; Nuclear magnetic resonance (NMR); NMR wipe out effect; SUPERCONDUCTOR; Physics of strongly correlated electron systems; Incommensurate Charge and Spin density wave

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

APA (6^th Edition):

Κουμούλης, . �. (2011). Φασματοσκοπικές μελέτες πυρηνικού μαγνητικού συντονισμού (NMR) σε οξείδια μετάλλων μετάπτωσης ισχυρής ηλεκτρονικής συσχέτισης με ενδογεν... (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/26144

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Κουμούλης, Δημήτριος. “Φασματοσκοπικές μελέτες πυρηνικού μαγνητικού συντονισμού (NMR) σε οξείδια μετάλλων μετάπτωσης ισχυρής ηλεκτρονικής συσχέτισης με ενδογεν...” 2011. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed January 24, 2021. http://hdl.handle.net/10442/hedi/26144.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Κουμούλης, Δημήτριος. “Φασματοσκοπικές μελέτες πυρηνικού μαγνητικού συντονισμού (NMR) σε οξείδια μετάλλων μετάπτωσης ισχυρής ηλεκτρονικής συσχέτισης με ενδογεν...” 2011. Web. 24 Jan 2021.

Vancouver:

Κουμούλης �. Φασματοσκοπικές μελέτες πυρηνικού μαγνητικού συντονισμού (NMR) σε οξείδια μετάλλων μετάπτωσης ισχυρής ηλεκτρονικής συσχέτισης με ενδογεν... [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2011. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10442/hedi/26144.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Κουμούλης �. Φασματοσκοπικές μελέτες πυρηνικού μαγνητικού συντονισμού (NMR) σε οξείδια μετάλλων μετάπτωσης ισχυρής ηλεκτρονικής συσχέτισης με ενδογεν... [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2011. Available from: http://hdl.handle.net/10442/hedi/26144

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Mississippi State University

13. Hardikar, Rahul P. DYNAMIC ELECTRON-PHONON INTERACTIONS IN ONE-DIMENSIONAL MODELS.

Degree: PhD, Physics and Astronomy, 2008, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-143010/ ;

► We study the unusual phases seen in charge transfer salts (CTS) at 1/2 and 1/4 filling. We use the Holstein-Hubbard model (HHM) and the Peierls… (more)

Subjects/Keywords: superconductivity; Mott phase; Peierls phase; Autocorrelation time; Charge Ordering; Phase diagram; Holstein Hubbard model; TMTTF; organic superconductors

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

APA (6^th Edition):

Hardikar, R. P. (2008). DYNAMIC ELECTRON-PHONON INTERACTIONS IN ONE-DIMENSIONAL MODELS. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-143010/ ;

Chicago Manual of Style (16^th Edition):

Hardikar, Rahul P. “DYNAMIC ELECTRON-PHONON INTERACTIONS IN ONE-DIMENSIONAL MODELS.” 2008. Doctoral Dissertation, Mississippi State University. Accessed January 24, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-143010/ ;.

MLA Handbook (7^th Edition):

Hardikar, Rahul P. “DYNAMIC ELECTRON-PHONON INTERACTIONS IN ONE-DIMENSIONAL MODELS.” 2008. Web. 24 Jan 2021.

Vancouver:

Hardikar RP. DYNAMIC ELECTRON-PHONON INTERACTIONS IN ONE-DIMENSIONAL MODELS. [Internet] [Doctoral dissertation]. Mississippi State University; 2008. [cited 2021 Jan 24]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-143010/ ;.

Council of Science Editors:

Hardikar RP. DYNAMIC ELECTRON-PHONON INTERACTIONS IN ONE-DIMENSIONAL MODELS. [Doctoral Dissertation]. Mississippi State University; 2008. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-143010/ ;

Queensland University of Technology

14. Goh, Roland Ghim Siong. Carbon nanotubes for organic electronics.

Degree: 2008, Queensland University of Technology

URL: https://eprints.qut.edu.au/20849/

► This thesis investigated the use of carbon nanotubes as active components in solution processible organic semiconductor devices. We investigated the use of functionalized carbon nanotubes… (more)

▼ This thesis investigated the use of carbon nanotubes as active components in solution processible organic semiconductor devices. We investigated the use of functionalized carbon nanotubes in carbon nanotubes network transistors (CNNFET) and in photoactive composites with conjugated polymers. For CNNFETs, the objective was to obtain detailed understanding of the dependence of transistor characteristics on nanotubes bundle sizes, device geometry and processing. Single walled carbon nanotubes were functionalized by grafting octadecylamine chains onto the tubes, which rendered them dispersible in organic solvents for solution processing. To investigate the dependence of electronic properties of carbon nanotubes networks on bundle size, we developed a centrifugal fractionation protocol that enabled us to obtain nanotube bundles of different diameters. The electronic properties of networks of nanotube bundles deposited from solution were investigated within a CNNFET device configuration. By comparing devices with different degree of bundling we elucidated the dependence of key device parameters (field effect mobility and on/off ratio) on bundle sizes. We further found that, in contrast to traditional inorganic transistors, the electronic properties of the CNNFETs were dominated by the channel rather than contact resistance. Specifically, the apparent mobility of our devices increased with decreasing channel length, suggesting that the charge transport properties of CNNFETs are bulk rather than contacts dominated. This meant that charge traps in the channel of the device had a significant effect on transport properties. We found that charge traps in the channel region introduced by adsorbed oxygen and silanol groups on the SiO2 surface were responsible for the dominant p-type conductance in as-fabricated devices. Based on this understanding, we demonstrated the p-type to n-type conversion of the transistor characteristics of CNNFETs by depositing nanotubes on electron-trapfree dielectric surfaces. Finally, by combining annealing and surface treatment, we fabricated CNNFETs with high n-type mobility of 6cm2/V.s. For polymer composites, the objective was to obtain detailed understanding of the interactions between carbon nanotubes and the conjugated polymer; a prerequisite for using these composites in organic electronic devices. We fabricated well dispersed nanotube/polymer composites by using functionalized carbon nanotubes and studied the effect of nanotubes addition on the photophysical properties of the technologically important conjugated polymer poly(3-hexylthiophene) (P3HT). Measurement of the photoluminescence efficiency of nanotubes/polymer composites showed that addition of 10wt% carbon nanotubes effectively quenched the polymer emission indicating close electronic interactions. This indicated that nanotubes/polymer composites have potential in organic photovoltaic or light-sensing devices. Further analysis of the steady-state photoluminescence spectra revealed that nanotube addition resulted in increased…

Subjects/Keywords: organic electronics, carbon nanotubes, field effect transistors, n-type, ptype, ambipolar, charge trapping, dielectric surface modification, conjugated polymers, polymer composites, polymer ordering, photoluminescence, photoluminescence efficiency; optical adsorption, scanning tunneling microscopy, self-assembly

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

APA (6^th Edition):

Goh, R. G. S. (2008). Carbon nanotubes for organic electronics. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/20849/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Goh, Roland Ghim Siong. “Carbon nanotubes for organic electronics.” 2008. Thesis, Queensland University of Technology. Accessed January 24, 2021. https://eprints.qut.edu.au/20849/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Goh, Roland Ghim Siong. “Carbon nanotubes for organic electronics.” 2008. Web. 24 Jan 2021.

Vancouver:

Goh RGS. Carbon nanotubes for organic electronics. [Internet] [Thesis]. Queensland University of Technology; 2008. [cited 2021 Jan 24]. Available from: https://eprints.qut.edu.au/20849/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Goh RGS. Carbon nanotubes for organic electronics. [Thesis]. Queensland University of Technology; 2008. Available from: https://eprints.qut.edu.au/20849/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

15. Anuradha, K N. Magnetization, Magnetotransport And Electron Magnetic Resonance Studies Of Doped Praseodymium And Bismuth Based Charge Ordered Manganites.

Degree: PhD, Faculty of Science, 2010, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/860

► Studies on perovskite rare earth manganites of general formula R1-xAxMnO3 (where R is a trivalent rare earth ion such as La3+, Pr3+ etc. and A… (more)

▼ Studies on perovskite rare earth manganites of general formula R1-xAxMnO3 (where R is a trivalent rare earth ion such as La3+, Pr3+ etc. and A is a divalent alkaline earth ion such as Ca2+, Sr2+, Ba2+, have been a very active research area in the last few years in condensed matter physics. Manganites have a distorted perovskite crystal structure with R and A ions situated at the cube corners, oxygen ions at the edge centers of the cube and Mn ions at the centres of the oxygen octahedra. In these manganites the Mn ions are found to be in mixed valence state i.e., in Mn3+ and Mn4+ states. In the octahedral crystal field of oxygen ions the single ion energy levels are split into t2g and eg levels. Mn3+ being a Jahn-Teller ion, the eg level is further split due to the Jahn-Teller effect. A strong Hund’s coupling between the spins in the t2g and eg levels renders the Mn3+ ions to be in the high spin state. The interplay of competing super exchange between Mn ions which determines the antiferromagnetism, orbital ordering and insulating behavior and double exchange between Mn ions which leads to ferromagnetism and metallicity gives rise to very complex phase diagrams of manganites as a function of composition, temperature and magnetic field. The strength of these interactions is determined by various factors such as the A-site cation radius and the Jahn-Teller distortion due to the presence of Mn3+ ions. The strongly coupled charge, spin, lattice and orbital degrees of freedom in manganites gives rise to complex phenomena such as colossal magnetoresistance (CMR), charge order (CO) and orbital order (OO) and phase separation (PS) etc. The properties of these materials are sensitive functions of external stimuli such as the doping, temperature and pressure [1-5] and have been extensively studied both experimentally and theoretically in single crystal, bulk polycrystalline and thin film forms of the samples [6-9]. Charge ordering is one of the fascinating properties exhibited by manganites. Charge ordering has historically been viewed as a precursor to the complex ordering of the Mn 3d orbitals, which in turn determine the magnetic interactions and these magnetic interactions are the driving force for charge localization and orbital order. This ordering of Mn3+ / Mn4+ charges can be destabilized by many methods. An external magnetic field can destabilize the charge ordered phase and drive the phase transition to the ferromagnetic metallic state [10-11]. Other than magnetic field, charge ordering can also be ‘melted’ by a variety of perturbations like electric field [12, 13], hydrostatic and chemical pressure [14-16], irradiation by X-rays [17], substitution at the Mn -site [18 -21] and A-site [22]. Of these, A-site substitution with bigger cations like barium is particularly of great interest since it does not interrupt the conduction path in the “MnO3” frame work Recently attention has been drawn towards the properties of nanoscale manganites. The nanoscale materials are expected to behave… Advisors/Committee Members: Bhat, S V (advisor).

Subjects/Keywords: Magnetism; Electron Magnetic Resonance; Manganites - Magnetism; Manganites - Electron Magnetic Resonance; Pervoskite Rare Earth Manganites; Colossal Magnetoresistance (CMR); Manganites - Electron Paramagnetic Resonance; Manganite; Nanomanganite; Nanowires; Charge Order; Nanoparticles; Charge-Ordering Fluctuations; Charge Ordered Manganites; Magnetism

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APA (6^th Edition):

Anuradha, K. N. (2010). Magnetization, Magnetotransport And Electron Magnetic Resonance Studies Of Doped Praseodymium And Bismuth Based Charge Ordered Manganites. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/860

Chicago Manual of Style (16^th Edition):

Anuradha, K N. “Magnetization, Magnetotransport And Electron Magnetic Resonance Studies Of Doped Praseodymium And Bismuth Based Charge Ordered Manganites.” 2010. Doctoral Dissertation, Indian Institute of Science. Accessed January 24, 2021. http://etd.iisc.ac.in/handle/2005/860.

MLA Handbook (7^th Edition):

Anuradha, K N. “Magnetization, Magnetotransport And Electron Magnetic Resonance Studies Of Doped Praseodymium And Bismuth Based Charge Ordered Manganites.” 2010. Web. 24 Jan 2021.

Vancouver:

Anuradha KN. Magnetization, Magnetotransport And Electron Magnetic Resonance Studies Of Doped Praseodymium And Bismuth Based Charge Ordered Manganites. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2010. [cited 2021 Jan 24]. Available from: http://etd.iisc.ac.in/handle/2005/860.

Council of Science Editors:

Anuradha KN. Magnetization, Magnetotransport And Electron Magnetic Resonance Studies Of Doped Praseodymium And Bismuth Based Charge Ordered Manganites. [Doctoral Dissertation]. Indian Institute of Science; 2010. Available from: http://etd.iisc.ac.in/handle/2005/860

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