Temperature and twist angle dependences of Josephson effect measured in [001] twist boundary of Bi-superconductor bicrystals

Bing She Xu, Hideki Ichinose, Shun Ichiro Tanaka, Yoichi Ishida

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Josephson junctions both direct (S/S) and indirect (S/Ag/S) with a thin silver layer were fabricated by solid state joining of (001) surfaces of two flaky Bi2Sr2CaCu2Ox single crystals. A small area junction of 100∼200 μm in diameter was fabricated by Ar+ ion selective etching of one of the two thin single crystalline superconducting Bi2Sr2CaCu2Ox flakes. A silver layer with a thickness of 2∼100 nm was deposited on the (001) planes by a sputtering method just prior to joining to produce S/Ag/S junctions. The critical current Ic of S/Ag/S junction was the function temperature with Ic = IOH(1-T/Tc)2 for T≧0.6Tc, and Ic=IOL exp (-GT1/2) for T≦0.5Tc. High Ic values were obtained when the [001] twist angle θ was 23°, 28° and 37°. It was indicated that the Josephson effect is strongly influenced by both the temperature T and the [001] twist angle θ in the S/S and S/Ag/S junctions.

Original languageEnglish
Pages (from-to)121-127
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume60
Issue number2
DOIs
Publication statusPublished - 1996 Jan 1
Externally publishedYes

Keywords

  • Bismuth-strontium-calcium-capper-oxygen superconductor
  • Josephson junction
  • Proximity effect
  • Twist boundary
  • Weak link

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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