We present a computational study of resonant inelastic x-ray scattering (RIXS) and x-ray absorption in a representative rare-earth nickelate ${\mathrm{LuNiO}}_3$. We study the changes in the spectra across the metal-insulator/site-disproportionation transition. In particular, we address the question of site selectivity of the two methods in the disproportionated insulating phase and the signature of metal-insulator transition in the fluorescencelike feature of the RIXS spectra. To this end we use the local-density approximation $+$ dynamical mean-field theory approach combined with the configuration integration method to compute the core-level spectra.

• Received 7 April 2020
• Accepted 11 August 2020

DOI:https://doi.org/10.1103/PhysRevB.102.085155