Resonant inelastic X-ray scattering in electronically quasi-zero-dimensional CuBO

Hancock, J. N.*; Chabot-Couture, G.*; Li, Y.*; Petrakovski, G. A.*; Ishii, Kenji; Jarrige, I.; Mizuki, Junichiro; Devereaux, T. P.*; Greven, M.*

We present a resonant inelastic scattering (RIXS) study using of CuBO, which contains a lattice of CuO plaquettes electronically isolated by B ions. The observed Cu -edge spectra show a small number of well-separated features, and the simple electronic structure of CuBO allows us to explore RIXS phenomenology. We find a low-energy feature that cannot be attributed to the same charge-transfer excitation discussed in other cuprates and is likely a transition thought to be forbidden under common considerations of -edge RIXS.