Threshold of magnetic field response of the superconducting proximity effect for ultrathin Pb/Ag metallic films

M. Caminale, A. A. Leon Vanegas, A. Stępniak, H. Oka, D. Sander, J. Kirschner

研究成果: Article査読

5 被引用数 (Scopus)

抄録

The proximity effect describes the extension of superconductivity into a metal, which is in contact with a superconductor. Scanning tunneling spectroscopy is used to probe this effect in a two-atomic-layer Pb/Ag nonsuperconducting film, surrounding a superconducting Pb nanoisland, with sub-nm spatial resolution. Here we show a nontrivial dependence of the length scales of the superconducting proximity effect on magnetic field. Surprisingly, we find that the magnetic field does not affect the induced superconductivity up to 0.3 T, but a breakdown of the proximity effect is induced for fields around 0.6 T, with a 1/Hp dependence with p≅7. The unexpected robustness of the induced superconductivity in the presence of magnetic fields is ascribed to the high electronic diffusivity in the metallic wetting layer.

本文言語English
論文番号220507
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
90
22
DOI
出版ステータスPublished - 2014 12月 5
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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