Self-energy of electron elementary excitation in a heavy fermion system due to electron-phonon interaction and superconducting transition temperature

The electron mass-enhancement factor, lambda, due to electron-phonon intera ction, has been evaluated in "heavy-fermion" systems using realistic phonon dispersion relations for heavy electrons and phonons. The effect of consid ering different models for electron screening has also been studied. Using the computed values of lambda, for CeCu2Si2, the observed superconducting t ransition temperature can be explained for mu* similar to 0.46, mu* being t he Coulomb pseudo-potential. (C) 1998 Elsevier Science B.V.