Abstract
Metastable thin films consisting of Pb(Ag) and Pb(Au) solid solutions with up to 12 at.% solute have been prepared by very rapid quenching from the melt (splat cooling). These solid solutions are not of the common, single-substitution type. The variation of the superconducting transition temperature T c with composition x has been determined. A linear decrease of T c with x was observed. By comparing the valence effects of T c in Pb(Ag) and Pb(Au) with those in other stable Pb solid solutions, an interstitial model was ruled out. The data support a di-substitutional model in which two solute atoms substitute for one solvent atom.
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