Abstract
The effect of charge transfer at the surface of binary alloys on surface segregation is studied in detail. Within the tight-binding Hamiltonian, analytic expressions for surface segregation are obtained, by using a rectangular shape of the d-band density of states. Surface segregation in CuNi alloys is studied in particular. In contrast to recent results we find that Cu segregates to the surface in the whole bulk concentration range independent of charge conservation.
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