THE ANOMALIES IN SPECIFIC HEAT: THE INFLUENCE OF KONDO EFFECT AND f-ELECTRON CORRELATION IN HEAVY FERMION (HF) SYSTEMS

Abstract

We report here a microscopic theory of the temperature dependence of the specific heat in heavy fermion (HF) systems. The standard model Hamiltonian consists of c–f spin exchange term and Heisenberg type inter-site spin–spin correlation in addition to the conduction electron and f-electron hopping terms. The Hamiltonian is treated in mean-field approximation (MFA) taking into account two mean-field parameters i.e. the Kondo singlet [Formula: see text] and f-electron correlation parameter [Formula: see text]. An attempt has been made in this present communication to calculate the temperature dependent of specific heat to study the peaks at Kondo and correlation temperatures. The evolution of peaks are studied by varying the model parameters and comparing its relation to the experimental data.