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19 April 2024

» arxiv » 2009.10932

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Fluctuating superconductivity in overdoped cuprate with a flat antinodal dispersion
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 ; Robert J. Birgeneau ; Thomas P. Devereaux ; Makoto Hashimoto ; Dung-Hai Lee ; Zhi-Xun Shen ;
Date:	23 Sep 2020
Abstract:	A major unsolved puzzle in cuprate superconductivity is that, despite accumulated evidence of more conventional normal state properties over the last 30 years, the superconducting $T_c$ of the overdoped cuprates seems to be still controlled by phase coherence rather than the Cooper pair formation. So far, a microscopic understanding of this unexpected behavior is lacking. Here we report angle-resolved photoemission, magnetic and thermodynamic evidence that Cooper pairs form at temperatures more than 30% above $T_c$ in overdoped metallic Bi$_2$Sr$_2$CaCu$_2$O$_{8+delta}$ (Bi-2212). More importantly, our data lead to a microscopic understanding where the phase fluctuation is enhanced by the flat dispersion near the Brillouin zone boundary. This proposal is tested by a sign-problem free quantum Monte Carlo simulation. Such a microscopic mechanism is likely to find applications in other flat band superconductors, such as twisted bilayer-bilayer graphene and NdNiO$_2$
Source:	arXiv, 2009.10932
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