Theory of Segregation at the Surface of Alloys —Effect of the Surface Phonon Softening—

Abstract

A theory of the surface segregation of alloys is proposed on the basis of the Einstein model for the lattice vibration and the tight-binding model for the electronic states. lt is shown by applying the theory to the monolayer model that the surface phonon softening affects the composition dependence of the enrichment by one component at the surface of alloys quantitatively and even qualitatively in some cases.