Properties of Lead-Indium Alloys. II. Specific Heat

Abstract

Specific-heat measurements have been made on a series of lead-indium alloys containing from 0 to 60 at.% indium. For each sample the data yield precise (within 1%) values for both the normal-state electronic specific-heat coefficient $\gamma$ and the Debye temperature ${\Theta }_D$. In addition, though with less precision, both the bulk thermodynamic critical field $H_c\mathrm{}\left(0\right)\mathrm{}$ and the first generalized Ginsburg-Landau parameter ${\kappa }_1$ have been obtained. These results, together with those previously obtained for the magnetic properties of the same system, provide a set of comprehensive data for bulk thermal and magnetic properties of Pb-In alloys. The data are examined in order to established to what extent strong-coupling and electronic structure effects may need to be incorporated into existing theoretical treatments. A combination of both effects is found to provide a quantitative explanation of the electronic specific-heat changes observed on alloying.