Formation of a coherent heavy electron state in the Anderson lattice model

Abstract

We present self-consistent calculations for the self-energy, thermodynamic potential, and magnetic susceptibility of the 2D asymmetric Anderson lattice Hamiltonian, in the fluctuation exchange approximation. For parameters that yield a large local moment, a narrow peak at the Fermi energy grows out of an otherwise smooth density of states as the system is cooled. The height of the peak reaches a maximum and then decreases, signaling the onset of coherence. The susceptibility shows a similar temperature dependence.