ORDER-N GREENS-FUNCTION TECHNIQUE FOR LOCAL ENVIRONMENT EFFECTS IN ALLOYS

We have developed a new approach to the calculations of ground state p roperties of large crystalline systems with arbitrary atomic configura tions based on a Green's function technique in conjunction with a self -consistent effective medium for the underlying randomly occupied latt ice. The locally self-consistent multiple scattering method and the co herent potential approximation are two simple limits of our general fo rmulation. The efficiency and the excellent convergence properties of the method are demonstrated in calculations for two alloy systems, Cu- Zn and Rh-Pd.