Abstract
The electrical responses to both CW and pulsed infrared radiation of highly oriented thin films of various high- T c oxide superconductors, LnBa 2 Cu 3 O y , La 2−x Sr x CuO 4 , and Ba 1−x K x BiO 3 have been investigated. All films show a clear deviation of the normalized response δV /( dV / dT ) irom a constant value at temperatures below T c which indicates the existence of a nonbolometric response. The responsivity and the normalized response of these materials as well as of BaPb 1− x Bi x O 3 are approximately inversely proportional to the Cooper pair density. These materials show a typical response time of 1 – 10 ns to pulsed radiation. These results can be explained on the basis of the nonequilibrium gap suppression model where the effective quasiparticle recombination time is dominated by the phonon escape time.
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