Stacking sequences in close-packed metallic superlattices

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Abstract
The ground-state stacking sequences of superlattices formed from two dissimilar close-packed metals are studied within the context of a simple tight-binding model. The main result is that the chemical potential for a stacking fault is a Friedel-like, damped, oscillatory function of its distance away from a bimetallic interface. Accordingly, a superlattice compositional boundary can favor unusual stacking-fault configurations and the bulk stacking structure of the constituent metals may not be a good guide to the structure of the superlattice. Application is made to recent diffraction data for ruthenium-iridium superlattices.

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