Abstract

The Josephson coupling between a conventional and a high-temperature superconductor is investigated theoretically for the case in which the high-${\mathit{T}}_{\mathit{c}}$ superconductor with its c axis perpendicular to the junction has a layer with a significantly depleted order parameter. If that layer is in contact with the junction barrier, it is demonstrated that the product of the junction resistance ${\mathit{R}}_{\mathit{n}}$ and the critical current ${\mathit{I}}_{\mathit{c}}$ can be substantially reduced from the standard Ambegaokar-Baratoff value. The result is discussed in connection with recent experiments aimed at exploring the symmetry of the order parameter in high-temperature superconductors.

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