Superconducting Fluctuations in Overdoped Bi2Sr2CaCu2O8+δ

Yu He; Su-Di Chen; Zi-Xiang Li; Dan Zhao; Dongjoon Song; Yoshiyuki Yoshida; Hiroshi Eisaki; Tao Wu; Xian-Hui Chen; Dong-Hui Lu; Christoph Meingast; Thomas P. Devereaux; Robert J. Birgeneau; Makoto Hashimoto; Dung-Hai Lee; Zhi-Xun Shen

doi:10.1103/PhysRevX.11.031068

Superconducting Fluctuations in Overdoped Bi2Sr2CaCu2O8+δ

Yu He, Su-Di Chen, Zi-Xiang Li, Dan Zhao, Dongjoon Song, Yoshiyuki Yoshida, Hiroshi Eisaki, Tao Wu, Xian-Hui Chen, Dong-Hui Lu, Christoph Meingast, Thomas P. Devereaux, Robert J. Birgeneau, Makoto Hashimoto, Dung-Hai Lee, Zhi-Xun Shen

DOI 10.1103/PhysRevX.11.031068 · Physical Review X

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Abstract

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 Bi2Sr2CaCu2O8+δ (Tc=66 K) despite the high carrier density. With a sign-problem-free quantum Monte Carlo calculation, we show how a partially flat band at (π,0) can 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	66	Pressure not reported	zero_resistance
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	66	Pressure not reported	onset
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	66	Pressure not reported	midpoint
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	66	Pressure not reported	unknown
(Pb,Bi)2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	66	Pressure not reported	zero_resistance