Density of states and electrical conductivity of disordered alloys with strong electron correlation

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Abstract
The density of states and the electrical conductivity of concentrated transition metal alloys is calculated, using an extended Hubbard model. Due to the combined influence of chemical disorder, electron-electron correlation and s-d hybridisation the conductivity varies strongly with the electron density n. Especially at high densities of states in the d band the scattering processes of the s electrons into the d band reduce considerably the magnitude of the conductivity. By that a qualitative agreement with experimental observations results. Considering the modification of the Fermi distribution function and of the density of states by changing the temperature, a contribution to the temperature dependence of the conductivity is obtained.