Spin Dynamics and Orbital State in LaTiO_3

Abstract

A neutron scattering study of the Mott-Hubbard insulator LaTiO${}_3$ (T${}_{\mathrm{N}}=132$ 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 LaTiO${}_3$.

final version, Phys. Rev. Lett. 85, 3946 (2000)

References in corpus (2)

• Orbital liquid in three dimensional Mott insulator: $LaTi{O}_3$
• Interplay between orbital ordering and lattice distortions in LaMnO3, YVO3, and YTiO3

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