Phonons in a W-Mo(001) superlattice

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Abstract
We have calculated dispersion relations and local mode densities for longitudinal phonons in the direction normal to the interfaces of W-Mo(001) superlattices by means of the surface Green-function matching method. A model including two-body and three-body interactions up to third neighbors, which gives an accurate description of the bulk dispersion relations, is employed. The influence of the interactions at the interfaces and the relative thicknesses of the constituents on the superlattice spectrum is studied and discussed.