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We develop an analytic and environment-dependent interatomic potential forthe overlap repulsion in solid argon, based on an approximate treatment of thenon-orthogonal Tight-Binding theory for the closed-shell systems. The presentmodel can well reproduce the observed elastic properties of solid argonincluding Cauchy violation at high pressures, yet very simple. A useful andnovel analysis is given to show how the elastic properties are related to theenvironment-dependence incorporated into a generic pairwise potential. Thepresent study has a close link to the broad field of computational materialsscience, in which the inclusion of environment dependence in short-rangedrepulsive part of a potential model is sometimes crucial in predicting theelastic properties correctly.Comment: 10 pages, 3 figure

A simple environment-dependent overlap potential and Cauchy violation in solid argon