Abstract
Valence mixing in CeN is attributed to two different hybridization processes, namely 4f-ligand and 4f--conduction-band hybridization. It is shown that the Ce 4f level mixes strongly with ligand N 2p orbitals and becomes nonmagnetic. This nonmagnetic state and the 4${f}^{1}$ local-moment state are nearly degenerate and hybridize weakly via 4f--5d-conduction-band hybridization, giving rise to the valence-fluctuation properties. Core-level, valence-band photoemission, and bremsstrahlung isochromat spectra are calculated with the use of a cluster model based on this picture, and good agreement with experiment is obtained.
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