title: Spin dynamics and orbital state in LaTiO3
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.
authors.affiliation: Max-Planck-Institut fur Festkorperforschung, 70569 Stuttgart, Germany and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
authors.initials: B
authors.lastname: Keimer
authors.initials: D
authors.lastname: Casa
authors.initials: A
authors.lastname: Ivanov
authors.initials: JW
authors.lastname: Lynn
authors.initials: M
authors.lastname: Zimmermann
authors.initials: JP
authors.lastname: Hill
authors.initials: D
authors.lastname: Gibbs
authors.initials: Y
authors.lastname: Taguchi
authors.initials: Y
authors.lastname: Tokura