Abstract
A wide variety of theories exists for modelling the proximity effect in superconductor/normal metal bilayers. However, their predictions of the resultant energy gap, its temperature dependence and the tunneling density of states are generally only qualitatively correct. In order to test these theories we have fabricated tunnel junctions with bilayer electrodes from a variety of different materials and have found that the relatively simple McMillan model agrees quantitatively in most cases. In addition, we have shown theoretically that the major undetermined parameter of this model, the transmission factor σ, may be determined exactly from fundamental quantities.
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