Microwave Properties of Granular Superconductors

Abstract
The microwave properties of a superconductor composed of small grains separated by tunneling barriers is calculated. In the absence of dc current, the ac conductivity is identical to that of a dirty superconductor. In the case of a nonvanishing current, the change in the conductivity due to the discontinuity in the phase of the energy-gap function across the tunneling barriers is smaller than that due to ordinary pair breaking.

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