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The Fabrication of Josephson Junctions on Y-Ba-Cu-O Thin Films

  • Jiro Yoshida
  • Koichi Mizushima
  • Masayuki Sagoi
  • Yoshiaki Terashima
  • Tadao Miura

Abstract

Electrical contact properties between noble metals and Y-Ba-Cu-O (YBCO) thin films prepared by multi-target rf sputtering method on (100) SrTiO3 and (100) MgO substrates were investigated. The temperature dependence of the contact resistance below the critical temperature of YBCO films suggested the existence of an insulating layer at the Au/YBCO interface. On the other hand, heat treated Ag/YBCO interface gave a very low contact resistance which could not be detected within the resolution limit of our apparatus. Based on this finding, we tried to fabricate Josephson junctions using lead as a counter electrode on the YBCO thin films covered by a thin silver layer expecting that the proximity effect worked between silver and YBCO. A dc “superconducting current” with undetectable resistance and a highly hysteretic current voltage (I–V) characteristic were observed below the transition temperature of lead.

Keywords

Critical Current Density Josephson Junction Tunnel Junction YBCO Film RHEED Pattern 
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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Jiro Yoshida
    • 1
  • Koichi Mizushima
    • 1
  • Masayuki Sagoi
    • 1
  • Yoshiaki Terashima
    • 1
  • Tadao Miura
    • 1
  1. 1.Research and Development CenterToshiba CorporationSaiwaiku, Kawasaki 210Japan

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