High-Temperature Thermal Resistivity of the Polyvalent Metals Al and Pb

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Abstract
This paper is an addendum to a previous paper dealing with the high-temperature thermal resistivity of monovalent metals. Herein we extend the theoretical approach, in an approximate way, to arbitrarily large Fermi surfaces, and compare the experimental "inelastic" thermal resistivities with those calculated using the pseudopotentials of Ashcroft and of Schneider and Stoll. The agreement between the observed and calculated values is good in the case of Al. For Pb, there appears to be a disagreement by about a factor of 2; here, however, the observed value depends strongly on the assumed phonon conductivity, and better agreement is obtained if large values, close to the predicitions of Leibfried and Schlomann, are taken for the latter. In addition, we have observed small deviations in the experimental values of Pb from the expected theoretical behavior which could be interpreted as being due to normal electron-electron scattering, and we briefly discuss this possibility.

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