Superconducting Fluctuations in Overdoped Bi2Sr2CaCu2O8 + δ
Abstract (englisch):
Fluctuating superconductivity—vestigial Cooper pairing in the resistive state of a material—is usually
associated with low dimensionality, strong disorder, or low carrier density. Here, we report single-particle
spectroscopic, thermodynamic and magnetic evidence for persistent superconducting fluctuations in the
heavily hole-doped cuprate superconductor Bi2Sr2CaCu2O8þδ(Tc¼66 K) despite the high carrier
density. With a sign-problem-free quantum Monte Carlo calculation, we show how a partially flat band
at ðπ;0Þcan help enhance superconducting phase fluctuations. Finally, we discuss the implications of an
anisotropic band structure on the phase-coherence-limited superconductivity in overdoped cuprates and
other superconductors.
associated with low dimensionality, strong disorder, or low carrier density. Here, we report single-particle
spectroscopic, thermodynamic and magnetic evidence for persistent superconducting fluctuations in the
heavily hole-doped cuprate superconductor Bi2Sr2CaCu2O8þδ(Tc¼66 K) despite the high carrier
density. With a sign-problem-free quantum Monte Carlo calculation, we show how a partially flat band
at ðπ;0Þcan help enhance superconducting phase fluctuations. Finally, we discuss the implications of an
anisotropic band structure on the phase-coherence-limited superconductivity in overdoped cuprates and
other superconductors.
| Zugehörige Institution(en) am KIT | Institut für QuantenMaterialien und Technologien (IQMT) |
| Publikationstyp | Zeitschriftenaufsatz |
| Publikationsmonat/-jahr | 09.2021 |
| Sprache | Englisch |
| Identifikator | ISSN: 2160-3308 KITopen-ID: 1000138483 |
| HGF-Programm | 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena |
| Erschienen in | Physical review / X |
| Verlag | American Physical Society (APS) |
| Band | 11 |
| Heft | 3 |
| Seiten | 031068 |
| Vorab online veröffentlicht am | 28.09.2021 |
| Nachgewiesen in | Dimensions Scopus Web of Science |