Twisted cuprate van der Waals heterostructures with controlled Josephson coupling
- Leibniz Institute for Solid State and Materials Science Dresden (IFW Dresden) (Germany); Technische Universität Dresden (Germany)
- Leibniz Institute for Solid State and Materials Science Dresden (IFW Dresden) (Germany)
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- National Institute for Materials Science (NIMS), Tsukuba (Japan)
- University of Naples Federico II (Italy)
- Terra Quantum AG, St. Gallen (Switzerland); City University of New York (CUNY), NY (United States)
Twisted van derWaals (vdW) heterostructures offer a unique platform for engineering the efficient Josephson coupling between cuprate thin crystals harboring the nodal superconducting order parameter. Preparing the vdW heterostructures-based Josephson junction comprising stacked cuprates requires maintaining an ordered interface with preserved surface superconductivity. Here, we report the preparation of the Josephson junction out of the stacked Bi2Sr2CaCu2O8+d crystals using the cryogenic dry transfer technique and encapsulating the junction with an insulating layer, that protects the interface during the electrical contacts evaporation at the 1×10-6 mbar base pressure. We find that the Josephson critical current $$I$$c has a maximum at low twist angles, comparable to that of the bulk intrinsic Josephson junctions, and is reduced by two orders of magnitude at twist angles close to 45°. In conclusion, the reduction of $$I$$c occurs due to a mismatch between superconducting $$d$$-wave order parameters, which suppresses the direct Cooper pair tunneling.
- 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)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 2284061
- Report Number(s):
- BNL--225258-2024-JAAM
- Journal Information:
- Materials Today, Journal Name: Materials Today Vol. 67; ISSN 1369-7021
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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