Tunneling from Pb into Al and Sn in Proximity
Previous studies in this laboratory on thin-film proximity sandwiches of Al and Sn at temperatures between 1.0 and 1.5°K have been reported.1,2 The density of electronic states in the proximity sandwiches was measured by tunneling into them from a superconducting Al base layer. The useful temperature range was limited by the transition temperature of the Al base layer, although the sandwiches exhibited higher transition temperatures of 3.0–4.0°K. In the present work a Pb base layer has been used and the measurements have thereby been extended up to the transition temperature of the sandwiches. Good agreement is obtained with McMillan’s theory of the superconducting proximity effect3 throughout the temperature region.
KeywordsQuartz Crystal Microbalance Conductance Curve High Transition Temperature Tunneling Conductance Tunneling Curve
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