Yejin Lee
;
Mickey Martini
;
Tommaso Confalone
;
Sanaz Shokri
;
Christian N. Saggau
;
Daniel Wolf
;
Genda Gu
;
Kenji Watanabe
(National Institute for Materials Science
)
;
Takashi Taniguchi
(National Institute for Materials Science)
;
Domenico Montemurro
;
Valerii M. Vinokur
;
Kornelius Nielsch
;
Nicola Poccia
Collection
Citation
Description:
(abstract)Van der Waals heterostructures made of high temperature cuprate superconductors hold high tech- nological promise. One of the obstackles hindering the progress is the detrimental effect of disorder on the characteristics of the Josephson junctions realized by the van der Waals heterostructures. Here we report the fabrication of twisted high-temperature superconducting Bi2Sr2CuCa2O8+δvan der Waals heterostructures that can achieve characteristics, in particular, critical current up to 1.2kA/cm2, similar to those of the intrinsic Josephson junctions in bulk crystals. We use a cryo- genic stacking technique and a solvent-free stencil mask method while additionally covering the interface with the insulating hBN 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 if it is fully encapsulated. We perform their direct comparison with the not encapsulated interface and reveal that the encapsulated interfaces show the main features of the coherent Josephson junctions such as: (i) a critical current comparable to the one of the intrin- sic Josephson junctions; (ii) non-monotonic temperature dependence of the critical current; (iii) the bulk value of the superconducting transition temperature. In addition, we find that heterostructures fabricated in this way are more stable in time.
Rights:
Keyword: Bi2Sr2CuCa2O8+δ superconductors, van der Waals heterostructures, Josephson junctions
Date published: 2023-01-24
Publisher: Wiley
Journal:
- Advanced Materials (ISSN: 15214095) vol. 35 issue. 15 2209135
Funding:
Manuscript type: Publisher's version (Version of record)
MDR DOI:
First published URL: https://doi.org/10.1002/adma.202209135
Related item:
Other identifier(s):
Contact agent:
Updated at: 2025-02-14 12:31:42 +0900
Published on MDR: 2025-02-14 12:31:42 +0900
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Advanced Materials - 2023 - Lee - Encapsulating High‐Temperature Superconducting Twisted van der Waals Heterostructures.pdf
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