Electronic Spectral Density in Heavy-Fermion Metals

Abstract

The electronic spectral density in heavy-fermion metals is determined by use of the periodic Anderson Hamiltonian with interatomic hybridization. The electronic density of states $N\left(\epsilon \right)$ exhibits pronounced structure consisting of a narrow peak centered at the Fermi level and two broad side peaks. These results are used to interpret x-ray photoemission spectroscopy and bremsstrahlung isochromat spectroscopy data. The electronic mass enhancement $\frac{m^{*}}{m}$ is calculated as a function of the intra-atomic Coulomb interaction.