Josephson tunneling studies of magnetic screening in proximity- superconducting silver

R. W. Simon, P. M. Chaikin

    Research output: Contribution to journalArticle

    Abstract

    The diamagnetic properties of silver backed by a thick lead layer have been studied as a function of normal-metal thickness and of temperature. Data were obtained by measuring the period of the magnetic field dependence of the critical Josephson current in S-I-N-S tunnel junctions. Strong screening has been seen at low temperatures and a thickness-independent penetration depth is indicated as the temperature goes to zero. This characteristic penetration depth is observed to be on the order of 1500 for proximity-effect silver. We have used a modified London equation for the case of a spatially varying pair amplitude and have numerically solved for the magnetic field profile in this system. The spatial dependence of the pair amplitude obtained from Landau-Ginzburg theory produces good agreement with thickness- and temperature-dependence data.

    Original languageEnglish (US)
    Pages (from-to)4463-4469
    Number of pages7
    JournalPhysical Review B
    Volume23
    Issue number9
    DOIs
    StatePublished - 1981

    ASJC Scopus subject areas

    • Condensed Matter Physics

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