Year: 2012
Type: article
Abstract: We present calculated spectral properties and lattice parameters for cerium pnictides (CeN, CeP, CeAs, CeSb, CeBi) and $\ensuremath{\gamma}$-Ce, within the LDA/GGA+DMFT (local density approximation/generalized gradient approximation+dynamical mean field theory) approach. The effective impurity model arising in the DMFT is solved by using the spin-polarized $T$-matrix fluctuation-exchange (SPTF) solver for CeN compound and the Hubbard I (HI) solver for CeP, CeAs, CeSb, and CeBi. For all the addressed compounds, the calculated spectral properties are in reasonable agreement with measured photoelectron spectra at high binding energies. At low binding energies, the HI approximation does not manage to capture the Kondo-like peak observed for several of the Ce pnictides. Nevertheless, the calculated lattice constants are in a good agreement with available experimental data, showing that the such a peak does not play a major role on the bonding properties. Furthermore, the HI calculations are compared to a simpler treatment of the Ce $4f$ electron as corelike in LDA/GGA for CeP, CeAs, CeSb, and CeBi, and the two approaches are found to give similar results.
Source: Physical Review B
Institution: Uppsala University
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1676926643