Dependence of Superconducting Transition Temperature on the Electron-Magnon, Electron-Phonon and Electron-Electron Interactions in a Heavy Fermion System

An explicit expression for the superconducting critical temperature, Tc, in a heavy fermion superconductor has been derived considering the presence of attractive electron-magnon and electron-phonon interactions, and repulsive residual electron-electron interaction responsible for superconductivity in these materials, using the generalized BCS gap equation. The dependence of Tcon these interactions is quite involved, but the observed value of Tcin CeCu2Si2, for example, can be explained using realistic physical parameters specifying the different interactions.