Abstract
The Cini–Sawatzky theory Auger CVV line shapes from solids and its extensions are based on single or multi-band Hubbard or Anderson models, retaining only the intra-atomic repulsion terms. In this work, we study the role of off-site interactions in closed bands systems. The local interaction terms are treated exactly, as usual, while off-site correlations are intorduced as a self-energy-like correction, on perturbative grounds. Our main result is that the effect of off-site interactions must be taken into account to obtain simultaneous agreement for the shape and the energy position of the CVV spectra. This conclusion is supported by recent experimental evidence and affects the derivation of U values from line shape analysis.
Published Version
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