The response of electronic nematic order to dynamical strain : a study of the iron based superconductors
Abstract/Contents
- Abstract
- Over the last decade, there has been increasing evidence that electronic nematic states, which break discrete rotational symmetry in crystalline solids, and their associated critical points are important constituents in the phase diagrams of several widely studied families of materials. Electronic nematic states are evident in the iron-based superconductors, and there are mounting indications of their presence in the cuprate and heavy fermion superconductors. This work discusses new techniques to investigate signatures of electronic nematicity, and more broadly addresses how dynamical mechanical deformation can be used to control and study materials. This thesis begins with the development and characterization of an improved technique for measuring the resistance response of materials to strain, using AC strain at frequencies between 10mHz and 10kHz. By using strain of the same symmetry as the electronic-nematic order parameter in Ba(Fe0.975Co0.025)2As2, this thesis demonstrate a novel and effective way to measure the dynamical nematic susceptibility, which has not been studied previously, and highlight potential future use cases in disordered media or high magnetic fields. Next, using dynamical strain of a different symmetry class than the nematic and Neel order parameters I show new anomalies in the elastoresistivity and elastocaloric effect of Ba(Fe0.975Co0.025)2As2, which extends the well-known Fisher-Langer theory of critical phenomena. Lastly, I study how the resistance response to an external mechanical perturbation is influenced by and encodes information about the thermal activated relaxation of domain walls in response to external stresses.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2019; ©2019 |
| Publication date | 2019; 2019 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Hristov, Alexander Tihomirov |
|---|---|
| Degree supervisor | Fisher, Ian R. (Ian Randal) |
| Thesis advisor | Fisher, Ian R. (Ian Randal) |
| Thesis advisor | Kivelson, Steven |
| Thesis advisor | Lee, Young Hee, 1955- |
| Degree committee member | Kivelson, Steven |
| Degree committee member | Lee, Young Hee, 1955- |
| Associated with | Stanford University, Department of Physics. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Alexander Tihomirov Hristov. |
|---|---|
| Note | Submitted to the Department of Physics. |
| Thesis | Thesis Ph.D. Stanford University 2019. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2019 by Alexander Tihomirov Hristov
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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