Temperature Dependence of the Electron Density of States and dc Electrical Resistivity of Disordered Binary Alloys

A model calculation of the temperature dependence of the electronic density of states and the electrical conductivity of disordered binary alloys, based on the coherent-potential approximation (CPA) is made by introducing thermal disorder in the single-band model (Velick\'y and others). Thermal disorder is found to broaden and smear the static-alloy density of states. The electrical resistivity in weak-scattering alloys always increases with temperature. However, in the strong-scattering case, the temperature coefficient of resistivity can be positive, zero, or negative, depending on the location of the Fermi energy.