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説明:

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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Bi2Sr2CuCa2O8+δ superconductors, van der Waals heterostructures, Josephson junctions

刊行年月日: 2023-01-24

出版者: Wiley

掲載誌:

• Advanced Materials (ISSN: 15214095) vol. 35 issue. 15 2209135

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/adma.202209135

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更新時刻: 2025-02-14 12:31:42 +0900

MDRでの公開時刻: 2025-02-14 12:31:42 +0900