Bailyn’s exchange correlation and phonon spectrum of sodium

Abstract

The phonon spectrum of sodium has been calculated by using Bailyn’s matrix elements for the electron-phonon interaction. There is satisfactory agreement with the experimental results of neutron scattering, specific heats, and elastic constants. An earlier work of the authors based on Toya’s matrix elements also gave nearly the same results. It employed an arbitrary constant α in the argument of the interference factor ( ‘g’ function). Bailyn’s expression has no arbitrary parameter and has, therefore, distinct advantages over the other.