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, Y. Tokura
Abstract
A neutron scattering study of the Mott-Hubbard insulator LaTiO3 (T N=132 K) reveals a spin wave spectrum that is well described by a nearest-neighbor superexchange constant J=15.5 meV and a small Dzyaloshinskii-Moriya interaction (D=1.1 meV). 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.
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