TY - JOUR
T1 - Orbital excitations in LaMnO3 studied by resonant inelastic x-ray scattering
AU - Inami, T.
AU - Fukuda, T.
AU - Mizuki, J.
AU - Ishihara, Sumio
AU - Kondo, H.
AU - Nakao, H.
AU - Matsumura, T.
AU - Hirota, K.
AU - Murakami, Y.
AU - Maekawa, S.
AU - Endoh, Y.
PY - 2003/1/15
Y1 - 2003/1/15
N2 - 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.
AB - 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.
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M3 - Article
AN - SCOPUS:0037438535
VL - 67
SP - 451081
EP - 451086
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 4
M1 - 045108
ER -