Abstract
We have investigate the optical response of YBa 2Cu 3O 7-δ grain boundary junctiond as well as single crystal strip lines. For both devices, bolometric siganal was detected between T c(zero) and T c(onset), whereas nonbolometric signal was observed only in a temperature range just above T c(zero) where the current-voltage characteristic showed nonlinear behavior. The content of nonbolometric signal in the total response signal was remarkably increased with decreasing the film thickness. The effect of a single grain boundary on the nonbolometric response was described.
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