COORDINATION-DEPENDENT EQUATIONS OF STATE AND PAIR POTENTIALS FOR COLD METAL CRYSTALS

Using a nearest-neighbor Heisenberg Hamiltonian approach, stemming fro m ideas of Poshusta and Klein, and based on results of Malrieu et al. for alkali and noble metals, a coordination-number- (c)-dependent equa tion of state at T=0 for metal crystals is proposed. From such a repre sentation of the pressure and the cohesive energy, a method of Carlsso n et al. can be used to extract a pair potential phi(c)(r) which is de nsity independent. Recent work of Robertson et al., stimulated by glue models of interatomic forces, fits into the above class of coordinati on-dependent properties over a limited range of near-neighbor distance .