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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number220507
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number22
DOIs
Publication statusPublished - 2014 Dec 5
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Threshold of magnetic field response of the superconducting proximity effect for ultrathin Pb/Ag metallic films'. Together they form a unique fingerprint.

  • Cite this