NEW ASPECTS ON ELECTRON-PHONON SYSTEM AT FINITE TEMPERATURES WITH AN APPLICATION ON LEAD AND MERCURY

The paper deals with the influence of the electron-phonon interaction on the properties of the conduction electrons in lead and mercury. The quasi-particle properties are considered in detail using Green's functions. Special attention is given to temperature effects in the effective mass as measured in cyclotron resonance or the electronic specific heat. It is shown that such a temperature dependence in the effective mass for lead and mercury should be possible to verify with the present experimental technique. The electronic specific heat in the normal state is far from linear in T at T ∼Tc, a fact which has some consequences for the interpretation of experiments on the thermodynamics of the superconducting state. © 1969 Springer-Verlag.