Abstract
The Josephson photoresponse of granular high-T c superconductor films to pulsed far infrared laser radiation has been investigated in magnetic fields of up to 3T. Its value is strongly influenced by fields less than 50mT and shows a pronounced hysteresis here. At low bias current densities, j b < 10A/cm 2, an applied field stimulates the photoresponse, while for j b > 100A/cm 2 the photoresponse is depressed. All changes have occured by a field of B < 50mT: for higher fields the photoresponse remains constant. This dependence is interpreted to arise from micrometre sized grain boundary junctions with a strongly inhomogenous critical current distribution on a sub-nanometre scale.
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