Abstract
We report a study of the critical current I c of YBa 2Cu 3O 7−δ (YBCO)/noble metal/conventional superconductor structures with noble-metal thicknesses in the range 20 nm to 1 μm and resistance-area products R n A between 10 −9 Ω cm 2 and 10 −5 Ω cm 2. Good agreement was found between the temperature dependence of I c and the predictions of a simple proximity-effect theory which assumed that there was no degraded layer between the YBCO and the noble metal. The magnitude of I c, corrected for the sample temperature and noble-metal thickness using the theory, was found to scale with R −1 n . These observations are shown to be consistent with a model in which the YBCO/noble metal interface is highly nonuniform with the total area of low-resistance contact making up only a small fraction of the total junction area. This explains the large interface resistivities observed in the YBCO/noble metal system.
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