MODIFIED TIGHT-BINDING APPROXIMATION AND ELECTRON-PHONON SPECTRAL FUNCTION FOR TRANSITION METALS

Abstract

The modified tight-binding approximation has been analyzed in detail and is applied to the derivation of an expression for electron-phonon spectral function (EPSF) which enters the strong coupling equations of superconductivity. Numerical calculations of the EPSF and the electron phonon coupling parameter λ for five transition metals, V, Nb, Mo, W, Ta have been performed.