We report resonant inelastic x-ray scattering experiments of the orbitally ordered manganite LaMnO3. When incident photon energy is tuned near the Mn K absorption edge, the spectra reveal three features at 2.5, 8, and 11 eV. The 8- and 11 -eV peaks are ascribed to transitions from the O 2p bands to the empty Mn 3d and 4s/4p bands, respectively. On the other hand, the 2.5-eV peak is considered an orbital excitation across the Mott gap, i.e., an electron excitation from the effective lower Hubbard band with the d3x2-r2 and d3y2 r2 orbital characters to the upper Hubbard band with the dy2-z2 and dz2 x2 ones. The weak dispersion and characteristic azimuthal angle dependence of this excitation are well reproduced by a theory which includes orbital degeneracy and strong electron correlation.
|Number of pages||6|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2003 Jan 15|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics