Spin Dynamics and Orbital State in LaTiO_3

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  • 1 February 2000
Abstract
A neutron scattering study of the Mott-Hubbard insulator LaTiO_{3} (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 with a dynamical Jahn-Teller effect. A resonant x-ray scattering study has uncovered no evidence of orbital order in LaTiO_3.

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