Flux-Trapping Characteristics of Pb-alloy Superconducting Thin Films for Josephson Tunnel Junctions

Naoto Uchida, Keiji Enpuku, Keiji Yoshida, Fujio Irie

研究成果: ジャーナルへの寄稿学術誌査読

抄録

Magnetic-flux trapping in Pb-alloy thin films is studied experimentally. In order to clarify pinning characteristics of thin films, which dominate flux trapping, trapped flux in Pb-alloy thin films is measured in-situ from the increment of the quasiparticle current of the Josephson junction made of these Pb-alloy thin films. Experimental results are discussed with the critical state model based on the pinning theory of superconductors. From the material dependence of flux trapping, it is shown that the addition of Au to Pb increases flux trapping due to the occurence of strong pinning centers of normal precipitates of AuPb2 and AuPb3 etc. It is also shown that the addition of Bi decreases flux trapping due to the large value of the London penetration depth of PbBi films. From the temperature dependence of flux trapping, it is shown that the amount of the trapped flux is reduced by raising the temperature of thin films. Finally, the effect of the trapped flux in junction electrodes on the suppression of the critical current of the junction is discussed quantitatively.

本文言語英語
ページ(範囲)667-677
ページ数11
ジャーナルShinku/Journal of the Vacuum Society of Japan
27
8
DOI
出版ステータス出版済み - 1月 1984

!!!All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 表面、皮膜および薄膜
  • 電子工学および電気工学

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