Comparison of statistical and Lindgren conduction-core exchange approximations in a priori pseudopotential calculations for the lattice dynamics of metals

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Abstract
Reports the results of a study of different approximations for the conduction-core exchange interactions in a priori nonlocal pseudopotential calculations of the phonon spectra of the alkali metals. These calculations are done with an exact treatment of the conduction electron potential. The results suggest that it is not possible to choose a unique conduction-core exchange approximation which is demonstrably superior for the calculation of phonon spectra for all the alkali metals.