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Encapsulating High–Temperature Superconducting Twisted van der Waals Heterostructures Blocks Detrimental Effects of Disorder

Journal Article · · Advanced Materials
 [1];  [1];  [2];  [1];  [2];  [2];  [3];  [4];  [5];  [6];  [7];  [1];  [2]
  1. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Technische Universität Dresden (Germany)
  2. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. National Institute for Materials Science (NIMS), Tsukuba (Japan). Research Center for Functional Materials
  5. National Institute for Materials Science (NIMS), Tsukuba (Japan). International Center for Materials Nanoarchitectonics
  6. Univ. of Naples Federico II (Italy)
  7. Terra Quantum AG, St. Gallen (Switzerland)
+ Show Author Affiliations

High-temperature cuprate superconductors based van der Waals (vdW) heterostructures hold high technological promise. One of the obstacles hindering their progress is the detrimental effect of disorder on the properties of the vdW-devices-based Josephson junctions (JJs). Here, a new method of fabricating twisted vdW heterostructures made of Bi2Sr2CuCa2O8+δ, crucially improving the JJ characteristics and pushing them up to those of the intrinsic JJs in bulk samples, is reported. The method combines cryogenic stacking using a solvent-free stencil mask technique and covering the interface by insulating hexagonal boron nitride crystals. Despite the high-vacuum condition down to 10–6 mbar in the evaporation chamber, the interface appears to be protected from water molecules during the in situ metal deposition only when fully encapsulated. Comparing the current-voltage curves of encapsulated and unencapsulated interfaces, it is revealed that the encapsulated interfaces' characteristics are crucially improved, so that the corresponding JJs demonstrate high critical currents and sharpness of the superconducting transition comparable to those of the intrinsic JJs. Finally, it is shown that the encapsulated heterostructures are more stable over time.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG); Japan Society for the Promotion of Science (JSPS KAKENHI)
Grant/Contract Number:
SC0012704
OSTI ID:
1968829
Report Number(s):
BNL-224199-2023-JAAM
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 15 Vol. 35; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

2D materials
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Josephson junctions
twisted high-temperature superconductors
van der Waals heterostructures