A study of two-dimensional superconductors with scanning-SQUID microscopy
Abstract/Contents
- Abstract
- Superconductors, with characteristic zero-resistance, Messier screening, and phase coherence at low temperatures, find applications in power transmission, high-speed transportation, and quantum computing. The warmest ambient pressure superconductor to date has a transition temperature of 100 Celsius below room temperature. Finding room-temperature superconductors is the holy grail. In order to achieve that, it is necessary to understand the superconducting mechanism through careful characterization of existing superconductors. In recent years, we have witnessed the discovery of several new superconducting systems. The infinite-layer nickelate, a structural analogy of the famous cuprates, was achieved through topotactic reduction. The twisted few-layer graphene systems displayed complex phase diagrams similar to the cuprates. The monolayer transition-metal dichalcogenide showed evidence of topological superconductivity. In addition, straining well-established high-temperature superconductors such as cuprates was found to enhance the critical temperature. The ever-so-vibrant research on superconductivity opens new possibilities for deciphering the mechanism of these strongly correlated electron systems. This thesis presents scanning SQUID microscopy (SSM) imaging of the above-mentioned superconductors. The SSM visualizes mesoscopic magnetic structures that cannot be seen in transport measurements. Our results break assumptions that might be used to extrapolate useful physical quantities in bulk measurements. Applying a local field, the SSM directly probes the local superfluid density, revealing spatial inhomogeneity and its interplay with intrinsic magnetic structures, namely vortices.
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 | 2023; ©2023 |
| Publication date | 2023; 2023 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Shi, Aoshuang |
|---|---|
| Degree supervisor | Moler, Kathryn |
| Thesis advisor | Moler, Kathryn |
| Thesis advisor | Goldhaber-Gordon, David |
| Thesis advisor | Hwang, Harold |
| Degree committee member | Goldhaber-Gordon, David |
| Degree committee member | Hwang, Harold |
| Associated with | Stanford University, School of Humanities and Sciences |
| Associated with | Stanford University, Department of Physics |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Ruby Aoshuang Shi. |
|---|---|
| Note | Submitted to the Department of Physics. |
| Thesis | Thesis Ph.D. Stanford University 2023. |
| Location | https://purl.stanford.edu/kt704ff2536 |
Access conditions
- Copyright
- © 2023 by Aoshuang Shi
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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