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Title: Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?

For overdoped cuprates, it is believed that the normal state behaves as an ordinary Fermi liquid while the superconducting state conforms to the BCS theory. We have put these beliefs to the test by a comprehensive experiment in which over two thousand cuprate films were synthesized by molecular beam epitaxy and studied in great detail and precision. Here in this paper, we compare our key experimental results to various proposed explanations based on BCS theory extended to dirty d-wave superconductors, including the cases of strong (unitary) and weak (Born) scattering on impurities. The discrepancies seem insurmountable, and point to the need to develop the theory further, likely beyond the canonical BCS paradigm.
Authors:
ORCiD logo [1] ;  [2] ;  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States); Applied Physics Dept.
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
BNL-203467-2018-JAAM
Journal ID: ISSN 1063-777X
Grant/Contract Number:
SC0012704; GBMF4410
Type:
Accepted Manuscript
Journal Name:
Low Temperature Physics
Additional Journal Information:
Journal Volume: 44; Journal Issue: 6; Journal ID: ISSN 1063-777X
Publisher:
American Institute of Physics (AIP)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Gordon and Betty Moore Foundation
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Superconductivity; cuprates; molecular beam epitaxy; BCS theory
OSTI Identifier:
1431457

Bozovic, Ivan, Bollinger, A. T., and He, X.. Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?. United States: N. p., Web. doi:10.1063/1.5037554.
Bozovic, Ivan, Bollinger, A. T., & He, X.. Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?. United States. doi:10.1063/1.5037554.
Bozovic, Ivan, Bollinger, A. T., and He, X.. 2018. "Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?". United States. doi:10.1063/1.5037554.
@article{osti_1431457,
title = {Can high-Tc superconductivity in cuprates be explained by the conventional BCS theory?},
author = {Bozovic, Ivan and Bollinger, A. T. and He, X.},
abstractNote = {For overdoped cuprates, it is believed that the normal state behaves as an ordinary Fermi liquid while the superconducting state conforms to the BCS theory. We have put these beliefs to the test by a comprehensive experiment in which over two thousand cuprate films were synthesized by molecular beam epitaxy and studied in great detail and precision. Here in this paper, we compare our key experimental results to various proposed explanations based on BCS theory extended to dirty d-wave superconductors, including the cases of strong (unitary) and weak (Born) scattering on impurities. The discrepancies seem insurmountable, and point to the need to develop the theory further, likely beyond the canonical BCS paradigm.},
doi = {10.1063/1.5037554},
journal = {Low Temperature Physics},
number = 6,
volume = 44,
place = {United States},
year = {2018},
month = {5}
}

Works referenced in this record:

High-temperature interface superconductivity between metallic and insulating copper oxides
journal, October 2008
  • Gozar, A.; Logvenov, G.; Kourkoutis, L. Fitting
  • Nature, Vol. 455, Issue 7214, p. 782-785
  • DOI: 10.1038/nature07293