PHOTOEMISSION AND INVERSE-PHOTOEMISSION STUDY OF FERROMAGNETIC VALENCE FLUCTUATING SYSTEM CEFE2

Various electron-spectroscopic results including core-level X-ray phot oemission, X-ray absorption, Ce 3d-4f and 4d-4f resonant photoemission , and inverse-photoemission spectroscopy on the valence fluctuating fe rromagnet CeFe2 are presented and analyzed with model calculations usi ng the Anderson-impurity Hamiltonian. Surface effects on the spectra a re taken into account in the analysis. The valence-band spectra are al so compared with the band-structure density of states calculated using the local-spin-density approximation. The validity of describing the Ce 4f states as a localized impurity level and in the 4f band picture is discussed. (C) 1998 Elsevier Science B.V.