Photoconductive response of granular superconducting films

The application of a DC magnetic field to disordered or granular films of Y-Ba-Cu-O is shown to lead an enhancement of a nonbolometric photoresponse at temperatures near and below T/sub c/. The disorder is evidenced by the broadened resistive transition to superconductivity and by the higher normal state resistance of the films. This observation is consistent with a nonequilibrium effect, which is described by the flux-flow model of the low-temperature photoresponse of granular superconductors.<
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