CURRENT TRANSPORT ACROSS YBA2CU3O7-AU INTERFACES

Current transport across each of the two YBa2Cu3O7-Au interfaces in a step-edge superconductor-normal metal-superconductor (SNS) Josephson j unction could be investigated independently, due to contacts to the Au interlayer. The I-V characteristics of each superconductor-normal met al (SN) interface showed de and sc Josephson-like effects fitting well to a model, which takes into account the influence of proximity effec t in the normal metal layer on the transport across the SN interface, and Andreev reflection at the interface. Fn the investigated junctions , both SN interfaces of the step SNS junctions had similar transparenc ies. (C) 1996 American Institute of Physics.