Abstract
We report high-resolution polarization-dependent resonant inelastic x-ray scattering (RIXS) at the O resonance of NiO showing a rich excitation spectrum. We perform multisite cluster model calculations, revealing that solid state effects are substantial. We identify a nonlocal charge transfer excitation at 4–5 eV and double-singlet creation at 1.75 eV, both exhibiting significant scattering geometry dependence. Apart from an intense band of local charge transfer excitations (above 5 eV) also excitations at 1 eV are observed. Finally, we point out that O RIXS of correlated metal oxides allows a quantitative and consistent determination of the charge transfer energy and the Hund coupling energy .
- Received 7 July 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.067402
©2006 American Physical Society