Abstract
A quantitative proximity electron tunneling spectroscopy (PETS) id demonstrated for the study of strong coupling superconductors which do not form suitable insulating oxides for conventional McMillan--Rowell tunneling spectroscopy. Proximity junctions of the form C-Al/sub 2/O/sub 3/-Al/S are employed, with Al thickness d/sub N/< or =100 A. Here S is the superconductor of interest and C is any convenient counterelectrode. The physical basis for the method, experimental techniques, and data obtained from foils of Nb are presented. The results for Nb include the energy-dependent pair potential ..delta../sub s/(E), the renormalization function Z(E), effective phonon spectrum ..cap alpha.. /sup 2/F(..omega..), electron-phonon coupling constant lambda, and Coulomb pseudopotential ..mu..*. A full discussion of the underlying theory and details of the methods of analysis employed to obtain, in addition, the pair potential of the Al proximity layer are contained in a following paper.
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