Resonant inelastic x-ray scattering of spin-charge excitations in a Kondo system
Résumé
Resonant inelastic x-ray scattering (RIXS) studies across the Ce M 5 edge have been carried out to investigate the electronic structure of the ferromagnetic CeAgSb 2 Kondo system. The RIXS spectra exhibit energy loss features corresponding to final states usually observed by combining photoemission and inverse photoemission spectroscopy. At low energy loss, a clear signature of the spectral features corresponding to the spin-orbit interaction is also observed. Polarization dependence provides evidence for the 1 S 0 symmetry singlet ground state by a total suppression of the f 0 final state. A simplified single-impurity Anderson model combined with full multiplet theory allows an accurate description of the spin-charge excitations. The RIXS data also reveal a strong temperature T dependence of the fluorescencelike structure. We conjecture that this behavior reflects the T dependence of the Kondo resonance.
Domaines
Matière Condensée [cond-mat]
Origine : Fichiers éditeurs autorisés sur une archive ouverte