We have fabricated SNS (superconductor-normal metal-superconductor) junctions consisting of YBa 2 Cu 3 O x (YBCO)/Ag/Nb trilayers in order to probe surface properties of the YBCO films. The trilayers are in situ deposited, and patterned by a photolithographic technique. These junctions exhibit Josephson-like behavior. The contact resistivity and its temperature dependence suggest that the weaklinks are formed inside YBCO and that the junction properties depend on the area of surface non-superconducting phases consisting of the YBCO components.
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Fujimaki et al. (1990) studied this question.
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