Theory Meets Experiment in Low-Dimensional Structures with Correlated Electrons
Prague, Czech Republic, July 1 – 4, 2019
LDA+DMFT approach to resonant inelastic x-ray scattering in correlated materials
We develop an ab-initio computational method for analyzing modern resonant inelastic x-ray scattering (RIXS) spectra in correlated materials, such as 3d transition-metal and 4f rare-earth compounds. The method builds on the combination of local density approximation (LDA) and dynamical mean-field theory (DMFT), and can describe fine RIXS features originating from both localized (e.g. multiplet excitations) and delocalized excitations (e.g. charge-transfer, unbound electron-hole pair excitations) . In this talk, we present calculated L-edge RIXS spectra for typical 3d transition-metal oxides: NiO, Fe2O3, LaMnO3 and RNiO3 with a comparison to high-resolution experimental data. We discuss the relation of the emergent charge excitations in RIXS spectra and low-energy valence states. Special attention will be paid on the coexistence/interference between the localized and delocalized excitations in the RIXS spectra, observed in recent experiments .
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