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Title: Crossover from two-dimensional to three-dimensional superconducting states in bismuth-based cuprate superconductor

Journal Article · · Nature Physics
ORCiD logo [1];  [1];  [2];  [1];  [2]; ORCiD logo [3];  [1];  [2];  [4];  [4];  [1];  [5]; ORCiD logo [5]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics, National Laboratory for Condensed Matter Physics
  2. Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics, National Laboratory for Condensed Matter Physics; Univ. of Chinese Academy of Sciences, Beijing (China)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Shanghai Synchrotron Radiation Facilities (China)
  5. Chinese Academy of Sciences (CAS), Beijing (China). Institute of Physics, National Laboratory for Condensed Matter Physics; Univ. of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Lab., Dongguan, Guangdong (China)

To decipher the mechanism of high-temperature superconductivity, it is important to know how the superconducting pairing emerges from the unusual normal states of cuprate superconductors, including the pseudogap, strange metal and anomalous Fermi liquid phases. A long-standing issue is how the superconducting pairing is formed and condensed in the strange metal phase, because this is where the superconducting transition temperature is highest. In this work, we use state-of-the-art high-pressure measurements to report the experimental observation of a pressure-induced crossover from two- to three-dimensional (2D to 3D) superconducting states in optimally doped Bi2Sr2CaCu2O8+δ bulk superconductor. By analysing the temperature dependence of the resistance, we find that the 2D superconducting transition exhibits a Berezinskii–Kosterlitz–Thouless-like behaviour. The emergence of this 2D superconducting transition provides direct evidence that the strange metal state is predominantly 2D-like. Lastly, this is important for a thorough understanding of the phase diagram of cuprate superconductors.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0012704
OSTI ID:
1580248
Report Number(s):
BNL-212484-2019-JAAM; TRN: US2102247
Journal Information:
Nature Physics, Vol. 16, Issue 3; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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