Resonant Inelastic X-Ray Scattering from Valence Excitations in Insulating Copper-Oxides

Abstract

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 to extract a spectral function from the raw data. We conclude by showing {\bf q}-dependent measurements of the charge transfer gap.

minor notational changes, discussion of anderson impurity model fixed, references added; accepted by PRL

References in corpus (1)

• Excitons in insulating cuprates

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