Spin Dynamics and Orbital State in LaTiO3

B. Keimer, D. Casa, A. Ivanov, J. W. Lynn, M. v. Zimmermann, J. P. Hill, D. Gibbs, Y. Taguchi, and Y. Tokura
Phys. Rev. Lett. 85, 3946 – Published 30 October 2000
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Abstract

A neutron scattering study of the Mott-Hubbard insulator LaTiO3 ( TN=132K) reveals a spin wave spectrum that is well described by a nearest-neighbor superexchange constant J=15.5meV and a small Dzyaloshinskii-Moriya interaction ( D=1.1meV). The nearly isotropic spin wave spectrum is surprising in view of the absence of a static Jahn-Teller distortion that could quench the orbital angular momentum, and it may indicate strong orbital fluctuations. A resonant x-ray scattering study has uncovered no evidence of orbital order in LaTiO3.

  • Received 2 February 2000

DOI:https://doi.org/10.1103/PhysRevLett.85.3946

©2000 American Physical Society

Authors & Affiliations

B. Keimer1,2, D. Casa2, A. Ivanov3, J. W. Lynn4, M. v. Zimmermann5, J. P. Hill5, D. Gibbs5, Y. Taguchi6, and Y. Tokura6

  • 1Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany
  • 2Department of Physics, Princeton University, Princeton, New Jersey 08544
  • 3Institut Laue-Langevin, 156X, 38042 Grenoble Cedex 9, France
  • 4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
  • 5Department of Physics, Brookhaven National Laboratory, Upton, New York 11973
  • 6Department of Applied Physics, University of Tokyo, Tokyo 113, Japan

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Vol. 85, Iss. 18 — 30 October 2000

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