Dynamically enhanced supercurrents in granular superconducting Y-Ba-Cu-O thin films

A. Driessen, Qian Tang, P. Hoekstra, Th.J.A. Popma

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    Thin superconducting films of Y-Ba-Cu-O withT c0≊89 K have been prepared by the aerosol deposition method. The voltage current characteristic of microbridges (typically 10×10µm2) made from the finely granular films, which behave like a network of boundary Josephson junctions, is highly nonlinear and shows besides thermal effects evidence for dynamic enhancement of the supercurrent. Our experimental data are in qualitative agreement with a theory developed for conventional superconductors by Aslamazov and Larkin and also by Tinkham. A value for the electron phonon scattering time has been derived: τ E ≊15 ps.
    Original languageEnglish
    Pages (from-to)347-357
    Number of pages11
    JournalJournal of low temperature physics
    Issue number5/6
    Publication statusPublished - 1991


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