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Charge-transfer exciton in La2CuO4 probed with resonant inelastic x-ray scattering

D. S. Ellis, J. P. Hill, S. Wakimoto, R. J. Birgeneau, D. Casa, T. Gog, and Young-June Kim
Phys. Rev. B 77, 060501(R) – Published 7 February 2008

Abstract

We report a high-resolution resonant inelastic x-ray scattering study of La2CuO4. A number of spectral features are identified that were not clearly visible in earlier lower-resolution data. The momentum dependence of the spectral weight and the dispersion of the lowest-energy excitation across the insulating gap have been measured in detail. The temperature dependence of the spectral features was also examined. The observed charge-transfer edge shift, along with the low dispersion of the first charge-transfer excitation, are attributed to the lattice motion being coupled to the electronic system. In addition, we observe a dispersionless feature at 1.8eV, which is associated with a d-d crystal field excitation.

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  • Received 3 December 2007

DOI:https://doi.org/10.1103/PhysRevB.77.060501

©2008 American Physical Society

Authors & Affiliations

D. S. Ellis1, J. P. Hill2, S. Wakimoto3, R. J. Birgeneau4, D. Casa5, T. Gog5, and Young-June Kim1,*

  • 1Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7
  • 2Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
  • 4Department of Physics, University of California, Berkeley, California 94720-7300, USA
  • 5CMC-XOR, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *yjkim@physics.utoronto.ca

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Issue

Vol. 77, Iss. 6 — 1 February 2008

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