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Persistent Josephson tunneling between Bi2 Sr2 CaCu2 O 8+x flakes twisted by 45° across the superconducting dome

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [2];  [4];  [3];  [5];  [6]
  1. Beijing Academy of Quantum Information Sciences (China); Hefei National laboratory (China)
  2. Tsinghua Univ., Beijing (China)
  3. Tsinghua Univ., Beijing (China); Ji Hua Laboratory, Guangdong (China)
  4. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  5. Beijing Academy of Quantum Information Sciences (China); Tsinghua Univ., Beijing (China); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
  6. Beijing Academy of Quantum Information Sciences (China); Tsinghua Univ., Beijing (China); Southern University of Science and Technology (SUSTech), Shenzhen (China)
+ Show Author Affiliations

There is a heated debate on the Josephson effect in twisted Bi2Sr2CaCu2O8+x flakes. Recent experimental results suggest the presence of either anomalously isotropic pairing or exotic d+id-wave pairing, in addition to the commonly believed d-wave one. Here, we address this controversy by fabricating ultraclean junctions with uncompromised crystalline quality and stoichiometry at the junction interfaces. In the optimally doped regime, we obtain prominent Josephson coupling (2-4 mV) in multiple junctions with the twist angle of 45°, in sharp contrast to a recent report that shows two orders of magnitude suppression around 45° from the value at 0°. We further extend this study to the previously unexplored overdoped regime and observe pronounced Josephson tunneling at 45° together with Josephson diode effect up to 50 K. In conclusion, our work helps establish the persistent presence of an isotropic pairing component across the entire superconducting phase diagram.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Ministry of Science and Technology of China; National Natural Science Foundation of China (NSFC); Innovation Program for Quantum Science and Technology
Grant/Contract Number:
SC0012704
OSTI ID:
2284073
Report Number(s):
BNL--225284-2024-JAAM
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 108; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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