Application of the screened Korringa-Kohn-Rostoker method

In the familiar Korringa-Kohn-Rostoker (KKR) or Green function method, wave propagation between scattering sites is described by the so-called structu re constants of the lattice (KKR structure constants), where these quantiti es are treated as having infinite spatial extent. In a recent development, it has been shown that the KKR method can be formulated in terms of screene d structure constants that are of finite range (the screened KKR method). H ere, we present an alternative formulation of the screened KKR method that is derived from simple manipulations of the multiple-scattering equations. We carry out density-of-states and total-energy calculations for spin-polar ized and non-spin-polarized materials using the method. We point out possib le unphysical features of the method.