The 4f-related valence-band density of states (DOS) of cerium metal is derived theoretically by means of the Greens-function technique with a decoupling procedure. A model Hamiltonian includes the Anderson-type mixing term, and the f-level degeneracy and spin-orbit splitting are explicitly taken into account. As a result of numerical calculations it was found that the structure near the Fermi edge of the 4f-related DOS is markedly influenced by the spin-orbit splitting if the mixing strength is much smaller than the splitting as well as the thermal energy kBT. It was also revealed that there appears a peak at a larger binding energy which is very sensitive to the shape of the conduction-band DOS. It is proposed that the present result should give an explanation for the difference between the valence-band photoemission spectra of - and -Ce metals.
ASJC Scopus subject areas
- Condensed Matter Physics