Low-Temperature Behavior and Dispersion Relations of Face-Centered Cubic Metals

Abstract

The temperature variation of the effective Debye temperature $\Theta$ near the absolute zero is investigated for some face-centered cubic metals on the basis of: (a) the Born and Begbie noncentral force theory taking nearest neighbor interactions only into account; (b) the customary central force model, used by Fine, Leighton, etc. The results are found to be qualitatively similar to those recently obtained by Bhatia and Horton on the basis of a model for monovalent metals proposed by Bhatia. Our results are based throughout on Houston's approximation to the frequency spectrum.