MICROWAVE EFFECTS ON YBA2CU3OY JOSEPHSON-JUNCTIONS WITH STEP-EDGE, BI-EPITAXIAL, AND SANDWICH GEOMETRIES

Fabrication and characterization of YBa2Cu3Oy Josephson junctions with step-edge, bi-epitaxial, and sandwich geometries are performed in thi s study to investigate the effects of microwave irradiation on the I-V characteristics. I-V curves under microwave irradiation reveal Shapir o steps. The width of the constant voltage steps were modulated by the microwave power. The period of the magnetic induction Delta B detecte d from the V-Phi curves for superconducting quantum interference devic es is temperature dependent. Additionally, T-c and I-c of the proximit y sandwich junctions are enhanced by the microwave irradiation. (C) 19 95 American Institute of Physics.