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Journal Articles

Orbital excitations in LaMnO studied by resonant inelastic X-ray scattering

Inami, Toshiya; Fukuda, Tatsuo; Mizuki, Junichiro; Ishihara, Sumio*; Kondo, Hiroshi*; Nakao, Hironori*; Matsumura, Takeshi*; Hirota, Kazuma*; Murakami, Yoichi*; Maekawa, Sadamichi*; et al.

Physical Review B, 67(4), p.045108_1 - 045108_6, 2003/01

https://doi.org/10.1103/PhysRevB.67.045108

Times Cited Count：56 Percentile：87.92(Materials Science, Multidisciplinary)

We report resonant inelastic x-ray scattering experiments of the orbitally ordered manganite LaMnO. When incident photon energy is tuned near the Mn absorption edge, the spectra reveal three features at 2.5 eV, 8 eV and 11 eV. The 8 eV and 11 eV peaks are ascribed to transitions from the O 2 bands to the empty Mn 3 and / bands, respectively. On the other hand, the 2.5 eV peak is considered an orbital excitation across the Mott gap, an electron excitation from the effective lower Hubbard band with the $d_{3x^2-r^2}$ and $d_{3y^2-r^2}$ orbital characters to the upper Hubbard band with the $d_{y^2-z^2}$ and $d_{z^2-x^2}$ 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.