The 4f electron character on core-level spectroscopies of AuCu₃-type Ce intermetallics

The 3d transition metal compounds and 4f rare earth compounds show attractive phenomena, such as superconductivity and Kondo effect, due to strong electron correlations among localized 3d and 4f electrons. Especially, the 4f electron state of Ce intermetallics causes the various phenomena of Ce intermetallics, Kondo effects and magnetic ordering, for example.
X-ray core-level spectroscopy is an efficient technique to investigate the electronic states of strongly correlated systems. Recent years, experimental techniques have been rapidly developing and, especially, the progress in experimental resolution has enabled us to observe fine spectral features, which were not formerly observed. These advantages will enable us to observe spectral fine features related with the 4f electron state related to Kondo effects and/or magnetic ordering of the Ce intermetallics.
In this study, we discuss 4f electron character of AuCu3-type Ce intermetallics by means of X-ray spectra, especially paying attention on the polarization dependence and the incident photon energy. In order to simulate the electronic state of AuCu3-type Ce intermetallics, we use an impurity Anderson model including realistic valence structure.