Theoretical Study on the Effect of Electron-Hole Pair Excitations in Resonant X-Ray Emission Spectroscopy for Ce Intermetallic Compounds(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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We calculate Ce 4f → 3d resonant X-Ray emission spectra (4f → 3d RXES) of Ce intermetallic compounds on the basis of the impurity Anderson model. The calculation is based on the second-order optical formula and the excitation of electron-hole (e-h) pairs in the conduction band is taken into account. In the calculation of the first-order optical processes such as X-Ray photoemission spectroscopy (XPS) and X-Ray absorption spectroscopy (XAS) for rare earth systems, even if they are metallic ones, the effect of e-h pairs is usually neglected on the basis of the 1/N_f expansion. We will point out the importance of taking into account e-h pairs in RXES by showing the calculated results of 4f → 3d RXES. In these spectra, the structures originating from e-h pairs newly appear, and the spectral weight transfer from the configuration without e-h pairs to that with e-h pairs is clearly observed. The reason why the effect of e-h pairs clearly appears in RXES is also discussed.
社団法人日本物理学会の論文
2002-11-15