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${}_4$

Abstract

We present a formula for the calculation of K-edge resonant inelastic x-ray scattering on transition metal compounds, based on a local interaction between the valence shell electrons and the $1s$ core hole. Extending a previous result, we include explicit momentum dependence and a basis with multiple core-hole sites. We apply this formula to a single-layered charge, orbital and spin ordered manganite, La${}_{0.5}$Sr${}_{1.5}$MnO${}_4$, and obtain good agreement with experimental data, in particular with regards to the large variation of the intensity with momentum. We find that the screening in La${}_{0.5}$Sr${}_{1.5}$MnO${}_4$ is highly localized around the core-hole site and demonstrate the potential of K-edge resonant inelastic x-ray scattering as a probe of screening dynamics in materials.

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