Abstract
The electrical responses to infrared radiation of highly oriented thin films of various high-T c oxide superconductors, LnBa2Cu3O y , La2-x Sr x CuO4, and Ba1−x K x BiO3, are systematically studied using modulated laser light. All films show clear nonbolometric responses at temperatures below T c. The strong correlation between the responsivity of the nonbolometric response and the Cooper pair density observed in these materials and BaPb1−x Bi x O3 confirms that the nonbolometric responses are due to nonequilibrium gap suppression. The present results also suggest that Ba1−x (K, Rb) x BiO3 is a promising material for use in sensitive detectors which can be operated using a closed-cycle refrigerator.
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