We report a Cu Kedge resonant inelastic x-ray scattering (RIXS) study of the orbital excitations in the orbital-ordered Mott insulator KCuF3. By performing the polarization analysis of the scattered photons, the excitation between the eg orbitals is successfully distinguished from the excitations from t2g to eg. The polarization dependence of the respective excitations is interpreted based on a phenomenological consideration of the symmetry of the RIXS process that yields a necessary condition for observing the excitations. Owing to our polarization analysis, we are able to measure the momentum dependence of the orbital excitation corresponding to the orbital degree of freedom over the whole Brillouin zone. The excitation is found to be dispersionless within our experimental resolution.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2011 Jun 16|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics