We report measurements of the transition temperature (TC) of superconducting films composed of various combinations of Ag and Pb layers. For samples with good electrical contact between the layers, the measured TC values show reasonable agreement with the Cooper model of the proximity effect. In poorly coupled samples, the normal layers appear to cause little if any suppression of the TC. We present a simple predictive expression for TC as a function of Ag content.
B. Kain, S. R. Khan and R. P. Barber, Jr. "Tuning the transition temperature of superconducting Ag/Pb films via the proximity effect," Physica C, 382, 411, (2002).