Abstract
The excitation spectra of the Ce monopnictides CeN, CeP, and CeAs are calculated using a lattice tight-binding model including the local Coulomb repulsion U on the Ce 4f orbitals. The model is treated within the dynamical mean-field theory, whereby the problem is mapped onto an effective Anderson impurity model. This is solved in a finite-U extension of the noncrossing approximation, including lowest-order crossing diagrams. The lattice model is parametrized by means of ab initio calculations. The calculated spectra are in good agreement with experiment. In particular, dispersive quasiparticle peak positions are found close to the Fermi edge in CeP. CeN shows metallic Fermi-liquid behavior with a correlation-induced mass enhancement factor of 5 around the Fermi level.
- Received 29 June 1998
DOI:https://doi.org/10.1103/PhysRevB.58.12817
©1998 American Physical Society