Experimental Test of the Theory of the Proximity Effect in Superconductors

Abstract
We have measured the transition temperatures of superimposed films of indium and thallium to test the theory of the proximity effect. There is good agreement between the experimental results and the theory. We have also measured the transition temperatures of superimposed films of lead and indium, for which strong electron-phonon coupling might invalidate the theory. The agreement with theory is again good, as found by other investigators.