CHARACTERISTICS OF ADVANCED YBA2CU3OX PRBA2CU3OX YBA2CU3OX EDGE TYPE JUNCTIONS

This letter describes the scaling behavior and Josephson properties of improved YBCO/PBCO/YBCO edge-type junctions. The critical current, normal-state resistance, and I(c)R(n) product scale with barrier thickness and junction area. The coherence length of the PBCO barrier is estimated to be between 5 and 8 nm. As unambiguous evidence of the Josephson behavior, the microwave response as a function of microwave power, as well as the current modulation with applied magnetic field, have been studied: well-developed Shapiro steps at 10 GHz have been observed, and the modulation of I(c)(H) shows Fraunhofer-like behavior with 95% I(c) suppression.