Thermopower and resistance of superconducting-normal interfaces II. Experiment

This paper presents experimental data on the thermopower and resistance of superconducting-normal interfaces in SNS junctions made from pure copper foils to which rods of pure lead or PbBi alloys are attached, measured using a SQUID voltmeter. The bulk thermopower for the superconducting excitations is found to be continuous with its normal value at T sub(c). The junctions made using dirty alloys in which the heat flow is phonon dominated show an unexplained large rise in boundary thermopower at low temperatures.