Penetration depth in proximity-effect superconductors

R. W. Simon, P. M. Chaikin

    Research output: Contribution to journalArticlepeer-review


    We have studied magnetic field penetration into the normal-metal side of proximity-effect sandwiches by measuring the periodic magnetic field dependence of the dc Josephson current in tunnel junctions containing the normal-metal/superconductor bilayers. The systems studied include the bilayers Ag/Pb, Al/Pb, Ag/Sn, and Sn/Pb and the trilayer sandwich Ag/Sn/Pb, in the temperature range down to 0.1 K. We find that the magnetic field is screened out of the normal metal in much the same way as for a type-I superconductor, with a penetration depth that becomes independent of the normal-metal thickness, or the temperature, at sufficiently low temperature. The magnitude of the induced normal-metal penetration depth is a function of the normal-metal parameters and the inverse of the gap in the backing superconductor.

    Original languageEnglish (US)
    Pages (from-to)3750-3756
    Number of pages7
    JournalPhysical Review B
    Issue number7
    StatePublished - 1984

    ASJC Scopus subject areas

    • Condensed Matter Physics


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