Resonant Inelastic X-Ray Scattering from Valence Excitations in Insulating Copper Oxides
Resonant Inelastic X-Ray Scattering from Valence Excitations in Insulating Copper Oxides
We report resonant inelastic x-ray measurements of insulating La$_2$CuO$_4$ and Sr$_2$CuO$_2$Cl$_2$ taken with the incident energy tuned near the Cu K absorption edge. We show that the spectra are well described in a shakeup picture in 3rd order perturbation theory which exhibits both incoming and outgoing resonances, and demonstrate how …