Order parameter texture of unconventional superconductors
Abstract/Contents
- Abstract
- A variety of unconventional superconductors have shown closely competitive tendencies towards different orderings. This leads to a rich phase diagram as a function of external tuning parameters, including magnetic fields and disorder. Under proper conditions, these perturbations can lead to inhomogeneous superconducting states, which become particularly important near phase transitions. The consequent inhomogeneity can affect the shape of the phase boundary, and the nature of phase transitions can be significantly altered. This thesis will illustrate these points under three circumstances. The first part of the thesis is about the competition between superconductivity and charge density wave (CDW) order. As local disorder suppresses charge ordering, it effectively enhances superconductivity. In the core of a dislocation of the CDW, local superconducting states can emerge. These superconducting puddles can develop long-range order at low temperatures. Chapter one will describe experimental signatures of this fragile superconducting state. The second part of the thesis is about the effect of inhomogeneous strain. In a clean system, the superconducting critical temperature of a chiral p-wave superconductor is a linear function of the uniaxial strain, and the phase diagram can host a tetracritical point. The shape of the superconducting phase boundaries near this critical point is significantly altered by the local variations of the uniaxial strain. The last part of the thesis is about the effect of quenched disorder near a first-order phase transition between two superconducting orderings. As the local ordering preference is disturbed by the disorder, superconducting inhomogeneity proliferates. The effect of thermal fluctuation is enhanced by inhomogeneity, which reduces the superconducting critical temperature near the first-order phase transition. This eventually leads to a non-monotonic phase boundary. The first-order phase transition itself may be destroyed under proper conditions.
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 | 2022; ©2022 |
| Publication date | 2022; 2022 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Yu, Yue, (Researcher on unconventional superconductors) |
|---|---|
| Degree supervisor | Kivelson, Steven |
| Degree supervisor | Raghu, Srinivas, 1978- |
| Thesis advisor | Kivelson, Steven |
| Thesis advisor | Raghu, Srinivas, 1978- |
| Thesis advisor | Hwang, Harold Yoonsung, 1970- |
| Thesis advisor | Kapitulnik, Aharon |
| Degree committee member | Hwang, Harold Yoonsung, 1970- |
| Degree committee member | Kapitulnik, Aharon |
| Associated with | Stanford University, Department of Physics |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Yue Yu. |
|---|---|
| Note | Submitted to the Department of Physics. |
| Thesis | Thesis Ph.D. Stanford University 2022. |
| Location | https://purl.stanford.edu/bm315gg3298 |
Access conditions
- Copyright
- © 2022 by Yue Yu
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
Also listed in
Loading usage metrics...