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Title: Superconducting Fluctuations in Overdoped Bi 2 Sr 2 CaCu 2 O 8 + δ

Journal Article · · Physical Review. X

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 Bi$$_2$$Sr$$_2$$CaCu$$_2$$O$$_{8+\delta}$$ ($$T_c$$ = 66~K) despite the high carrier density. With a sign-problem free quantum Monte Carlo calculation, we show how a partially flat band at ($$\pi$$,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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); National Key R&D Program of the MOST; National Natural Science Foundation of China (NSFC); Gordon and Betty Moore Foundation (GBMF); Miller Institute for Basic Research in Science
Grant/Contract Number:
AC02-76SF00515; AC02-05-CH11231; AC02-05CH11231; ECCS-1542152; 2017YFA0303001; GBMF4545; 11888101
OSTI ID:
1822958
Alternate ID(s):
OSTI ID: 1811706; OSTI ID: 1829211; OSTI ID: 1877036
Journal Information:
Physical Review. X, Journal Name: Physical Review. X Vol. 11 Journal Issue: 3; ISSN 2160-3308
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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