Pii: S0964-1807(99)00039-3
نویسندگان
چکیده
ÐWe report our studies on light-induced changes in electrical properties of YBa2Cu3Ox (YBCO) grain-boundary Josephson weak links. We discuss the erasable process (photodoping), in which light-induced enhancement of junctions properties at low temperatures relaxes back above 250 K. Our studies are focused on the junction critical current versus time, light intensity, and magnetic ®eld measurements. In tested few-mm-wide step-edge junctions, photodoping manifested itself as above 50% increase of the critical current and the decrease of the junction magnetic penetration depth, leading to reduction of the eective junction width. Contrary to the photodoping eect, the high-intensity laser modi®cation of junctions led to permanent modi®cation of their electrical characteristics that remained unchanged after subsequent room-temperature/helium thermal cycling of the sample. The laser-modi®ed junctions exhibited up to 25% increase of the critical current times normal-state resistance product. # 1999 Elsevier Science Ltd. All rights reserved
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