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

T. Inami, T. Fukuda, J. Mizuki, S. Ishihara, H. Kondo, H. Nakao, T. Matsumura, K. Hirota, Y. Murakami, S. Maekawa, and Y. Endoh
Phys. Rev. B 67, 045108 – Published 27 January 2003
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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 d3x2r2 and d3y2r2 orbital characters to the upper Hubbard band with the dy2z2 and dz2x2 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.

  • Received 13 September 2002

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

©2003 American Physical Society

Authors & Affiliations

T. Inami, T. Fukuda, and J. Mizuki

  • Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute (SPring-8), Hyogo 679-5148, Japan
  • Core Research for Evolutional Science and Technology (CREST), Tsukuba 305-0047, Japan

S. Ishihara

  • Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • Core Research for Evolutional Science and Technology (CREST), Tsukuba 305-0047, Japan

H. Kondo

  • Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • Core Research for Evolutional Science and Technology (CREST), Tsukuba 305-0047, Japan

H. Nakao, T. Matsumura, K. Hirota, and Y. Murakami

  • Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • Core Research for Evolutional Science and Technology (CREST), Tsukuba 305-0047, Japan

S. Maekawa and Y. Endoh

  • Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • Core Research for Evolutional Science and Technology (CREST), Tsukuba 305-0047, Japan

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Vol. 67, Iss. 4 — 15 January 2003

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