Abstract
Resonant inelastic x-ray scattering (RIXS) at theL2,3 edgesof 3d transition metal compounds has recently become a high resolution spectroscopictechnique thanks to improvements in the instrumentation. We have chosen theprototypical case of NiO to explore the various levels of interpretation applicable toL3 RIXSspectra of strongly correlated electron systems. Starting from a set of experimental data measured acrossthe Ni L3 absorption edge with 550 meV combined energy resolution, we analyse the richspectral structure within an atomic framework. The spectra can be separated intodd and charge transferexcitation regions. The dd excitations can be interpreted and well reproduced within a crystal field model. The chargetransfer excitations are analysed through the comparison with calculations made in theAnderson impurity model. A series of parameters belonging to the proposed models(crystal field strength, charge transfer energy, hybridization integrals) can thus be extractedin a very direct and unambiguous way.
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