Enhancement of Delta C-v/T-c over BCS value

The ratio DeltaC(v)/T-c for the specific heat jump (DeltaC(v)) at the super conducting transition temperature (T-c) has been calculated for the correla ted electron systems within the van Hove scenario for the normal state elec tronic density of stales. The effect of electron correlations has been take n into account using Gutzwiller variational method. It is found that the in terplay between electron-electron interaction and electron-phonon interacti on plays an important role in enhancing the ratio DeltaC(v)/T-c. Our findin gs should be relevant to a number of superconducting compounds of recent in terest.