Analysis of resonant inelastic x-ray scattering at the $K$ edge in NiO

Abstract

We analyze the resonant inelastic x-ray scattering (RIXS) spectra at the Ni $K$ edge in an antiferromagnetic insulator NiO by applying the theory developed by the present authors. It is based on the Keldysh Green's function formalism, and treats the core-hole potential in the intermediate state within the Born approximation. We calculate the single-particle energy bands within the Hartree-Fock approximation on the basis of the multi-orbital tight-binding model. Using these energy bands together with the $4p$ density of states from an ab initio band structure calculation, we calculate the RIXS intensities as a function of energy loss. By taking account of electron correlation within the random phase approximation (RPA), we obtain quantitative agreement with the experimental RIXS spectra, which consist of prominent two peaks around 5 eV and 8 eV, and the former shows considerable dispersion while the latter shows no dispersion. We interpret the peaks as a result of a band-to-band transition augmented by the RPA correlation.

arXiv comment11 pages, 10 figures, submitted to PRB

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Cited by in corpus (12)

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• Elementary excitations probed by L-edge resonant inelastic x-ray scattering in systems with weak and intermediate electron correlations
• Directional Dichroism of X-Ray Absorption in a Polar Ferrimagnet GaFeO_3
• Analysis of Incident-Photon-Energy and Polarization Dependent Resonant Inelastic X-Ray Scattering from La${}_2$CuO${}_4$
• Microscopic Analysis of Resonant Inelastic X-Ray Scattering in Orbital-Ordered KCuF3
• Charge Excitations in Cuprate and Nickelate in Resonant Inelastic X-Ray Scattering
• Two-magnon excitations in resonant inelastic x-ray scattering studied by spin-density-wave formalism
• Analysis of Resonant Inelastic X-Ray Scattering in Stripe-Ordered Nickelate
• Momentum dependence in K-edge resonant inelastic x-ray scattering and its application to screening dynamics in CE-phase La${}_{0.5}$Sr${}_{1.5}$MnO${}_4$