Superconducting fluctuations in overdoped BiSrCaCuO
arXiv:2009.10932 · doi:10.1103/PhysRevX.11.031068
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 heavily hole-doped cuprate superconductor BiSrCaCuO ( = 66~K) despite the high carrier density. With a sign-problem free quantum Monte Carlo calculation, we show how a partially flat band at (,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.
arXiv commentmain: 8 pages, 6 figures + supplement: 10 pages, 15 figures
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