Superconductivity in an Ag-Pd-Ag epitaxial metal film sandwich

Superconductivity is observed in an epitaxial metal film sandwich of Ag-Pd-Ag, with $T_c=2.15\mathrm{}$ K, initially. Room-temperature storage caused $T_c$ to drop to 1.00 K after 180 days, and the $T_c$ decrease was accompanied by development of a resistivity minimum. The large orbital contribution to $H_{c^2}$ 70 kOe/K, is comparable to those found in high $H_{c^2}$ Chevrel-phase materials.