High precision photoemission study of overdoped Bi2212 superconductors
Abstract/Contents
- Abstract
- High-temperature superconductivity in the cuprates is a complex and enduring problem. The complexity is evidenced by the phase diagram, where superconductivity is intertwined with a plethora of unconventional states in the pseudogap regime. In this thesis, we try to disentangle superconductivity from such states to better understand its nature. Using angle-resolved photoemission spectroscopy, we first study the cuprate phase diagram near the pseudogap critical doping in Bi2Sr2CaCu2O8+δ (Bi2212). With increasing doping, we find a temperature-independent boundary across which the pseudogap ends and quasiparticle-like excitations recover. The result challenges presumptions associating the pseudogap with a quantum critical point and suggests a relatively simple region in the phase diagram where superconductivity emerges from a Fermi-liquid-like normal state. In the second part, we focus on this pseudogap-free region to study the superconducting phase transition. We discover that the transition temperature coincides with the most rapid drop of zero-energy spectral intensity instead of the opening of the superconducting gap. We also observe a strong momentum anisotropy in the spectral signatures associated with the transition. These observations are consistent with the scenario that the superconducting transition in overdoped Bi2212 is driven by phase fluctuations.
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 | 2021; ©2021 |
| Publication date | 2021; 2021 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Chen, Sudi |
|---|---|
| Degree supervisor | Shen, Zhi-Xun |
| Thesis advisor | Shen, Zhi-Xun |
| Thesis advisor | Kivelson, Steven |
| Thesis advisor | Lee, Young-Choon, 1973- |
| Degree committee member | Kivelson, Steven |
| Degree committee member | Lee, Young-Choon, 1973- |
| Associated with | Stanford University, Department of Applied Physics |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Su-di Chen. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis Ph.D. Stanford University 2021. |
| Location | https://purl.stanford.edu/kr375dv3729 |
Access conditions
- Copyright
- © 2021 by Sudi Chen
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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