Abstract
Hysteretic high Tc Josephson junctions were fabricated by shunting grain boundary YBa2Cu3O7 junctions with a monolithic Au film capacitor. The junctions were made by pulsed laser deposition with ion milling, and the shunt capacitor by rf sputter deposition and lift-off. The McCumber parameter βc obtained from the measured current-voltage curves was much smaller (<6) than the calculated values (3×103−3×104). The discrepancy is believed to be due to that the series resistance of the Au film dominates the capacitive reactance in the high voltages and thus reduces the hys resistance.
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