Electronic structure of disordered CuNi alloys

We present the complex energy bands and electronic densities of states in paramagnetic CuNi alloys. The calculations are based on the use of muffin-tin potentials within the framework of the average-$t$-matrix approximation. The theory is shown to predict reasonably the electronic spectrum over a wide range of energies and alloy compositions. The experiments to be discussed include photoemission measurements of the density of states and Dingle-temperature measurements of the damping of both the neck and belly orbits. The half-width of the Ni virtual bound state in Cu-rich CuNi alloys is discussed in detail.