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Single-domain, epitaxially-grown Nb(110)/Au(111)/Nb(110) trilayers arestudied in order to elucidate the superconducting proximity effect in theAu(111) layer. The critical current density, superconducting coherence length,and superconducting transition temperature, all show a non-monotonic dependenceon the thickness of the Au layer. The analysis of the experimental datareasonably argues that a form of order-parameter oscillation is intrinsic tothe proximity-induced Cooper pairs in the Au layer. We find that relative phaseof the superconducting order parameter in the two Nb(110) layers changes signas a function of Au(111) layer thickness tAu, offering a route to achieving a{\pi} junction for 0.94 nm<tAu<1.88 nm.

Superconducting proximity effect in epitaxial Nb(110)/Au(111)/Nb(110) trilayers