Orbital excitations in LaMnO3 studied by resonant inelastic x-ray scattering

T. Inami, T. Fukuda, J. Mizuki, Sumio Ishihara, H. Kondo, H. Nakao, T. Matsumura, K. Hirota, Y. Murakami, S. Maekawa, Y. Endoh

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number045108
Pages (from-to)451081-451086
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number4
Publication statusPublished - 2003 Jan 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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