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You searched for +publisher:"University of St. Andrews" +contributor:("Wahl, Peter"). Showing records 1 – 2 of 2 total matches.

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University of St. Andrews

1. Trainer, Christopher William James. The effect of changing crystal structures on the magnetic and superconducting properties of the iron based superconductors and their parent compounds .

Degree: 2018, University of St. Andrews

Superconductivity in high temperature superconducting materials arises due to the constituent electrons becoming strongly correlated. In particular, in the Iron based family of superconductors, antiferromagnetic fluctuations of the electron spins and charge fluctuations of the Iron d-orbitals are thought to be important. The strong correlations of the electrons in an Iron based superconductor lead to the electronic ground state adopting a lower symmetry than the crystal lattice. Transport studies of these systems under the application of uniaxial strain show a strongly anisotropic response of the materials to straining along different lattice directions, suggesting that the electronic correlations are in fact coupled to the lattice. In this thesis I present a study of the response of the magnetic and superconducting states of these Iron based materials to changes of their crystal structure induced by applying uniaxial strain or through doping. I first examine the response of the magnetism in Fe₁₊ₓTe, the parent compound of the Iron chalcogenides, to the change that occurs in the crystal structure as the system is doped with Iron. I present a spin polarized STM study of the magnetism throughout the phase diagram of Fe₁₊ₓTe using in-situ prepared magnetic tips to measure the spin structure. By using the STM tip to remove excess Iron atoms from the surface I show that it is possible to decouple the effects of the excess Iron atoms from the change of crystal structure. Therefore showing the effect of the structural change on the magnetism. Next I present an STM study of how the superconductivity in the tetragonal LiFeAs system responds to the application of uniaxial strain deforming the crystal structure. I describe the construction of a modifed STM sample holder that allows for the in-situ application of a variable Strain to the LiFeAs sample. I present the resulting impact of this straining process to the superconductivity of LiFeAs on an atomic scale and report the formation of a strain induced charge density wave state that coexists with the superconductivity. In the final chapter I report a quasiparticle interference study of the superconducting state of Sulphur doped FeSe and discuss the results in comparison of those from the literature for the undoped FeSe system. Advisors/Committee Members: Wahl, Peter (advisor).

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

APA (6th Edition):

Trainer, C. W. J. (2018). The effect of changing crystal structures on the magnetic and superconducting properties of the iron based superconductors and their parent compounds . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/17755

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

Chicago Manual of Style (16th Edition):

Trainer, Christopher William James. “The effect of changing crystal structures on the magnetic and superconducting properties of the iron based superconductors and their parent compounds .” 2018. Thesis, University of St. Andrews. Accessed July 14, 2020. http://hdl.handle.net/10023/17755.

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

MLA Handbook (7th Edition):

Trainer, Christopher William James. “The effect of changing crystal structures on the magnetic and superconducting properties of the iron based superconductors and their parent compounds .” 2018. Web. 14 Jul 2020.

Vancouver:

Trainer CWJ. The effect of changing crystal structures on the magnetic and superconducting properties of the iron based superconductors and their parent compounds . [Internet] [Thesis]. University of St. Andrews; 2018. [cited 2020 Jul 14]. Available from: http://hdl.handle.net/10023/17755.

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

Council of Science Editors:

Trainer CWJ. The effect of changing crystal structures on the magnetic and superconducting properties of the iron based superconductors and their parent compounds . [Thesis]. University of St. Andrews; 2018. Available from: http://hdl.handle.net/10023/17755

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


University of St. Andrews

2. Neat, Matthew James. Scanning tunnelling microscopy and spectroscopy of quantum materials .

Degree: 2018, University of St. Andrews

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

APA (6th Edition):

Neat, M. J. (2018). Scanning tunnelling microscopy and spectroscopy of quantum materials . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/13008

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

Chicago Manual of Style (16th Edition):

Neat, Matthew James. “Scanning tunnelling microscopy and spectroscopy of quantum materials .” 2018. Thesis, University of St. Andrews. Accessed July 14, 2020. http://hdl.handle.net/10023/13008.

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

MLA Handbook (7th Edition):

Neat, Matthew James. “Scanning tunnelling microscopy and spectroscopy of quantum materials .” 2018. Web. 14 Jul 2020.

Vancouver:

Neat MJ. Scanning tunnelling microscopy and spectroscopy of quantum materials . [Internet] [Thesis]. University of St. Andrews; 2018. [cited 2020 Jul 14]. Available from: http://hdl.handle.net/10023/13008.

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

Council of Science Editors:

Neat MJ. Scanning tunnelling microscopy and spectroscopy of quantum materials . [Thesis]. University of St. Andrews; 2018. Available from: http://hdl.handle.net/10023/13008

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

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