Spin Dynamics and Orbital State in LaTiO_3

B. Keimer; D. Casa; A. Ivanov; J. W. Lynn; M. v. Zimmermann; J. P. Hill; D. Gibbs; Y. Taguchi; Y. Tokura

doi:10.1103/PhysRevLett.85.3946

Spin Dynamics and Orbital State in LaTiO_3

Strongly Correlated Electrons 2009-10-31 v2

Authors: B. Keimer , D. Casa , A. Ivanov , J. W. Lynn , M. v. Zimmermann , J. P. Hill , D. Gibbs , Y. Taguchi , Y. Tokura

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Abstract

A neutron scattering study of the Mott-Hubbard insulator LaTiO $_{3}$ (T $_{{\rm N}}=132$ 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 $_{3}$ .

Keywords

spin excitations in condensed matter frustrated magnetism spin-orbit coupling

Cite

@article{arxiv.cond-mat/0002014,
  title  = {Spin Dynamics and Orbital State in LaTiO_3},
  author = {B. Keimer and D. Casa and A. Ivanov and J. W. Lynn and M. v. Zimmermann and J. P. Hill and D. Gibbs and Y. Taguchi and Y. Tokura},
  journal= {arXiv preprint arXiv:cond-mat/0002014},
  year   = {2009}
}

Comments

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

Spin Dynamics and Orbital State in LaTiO_3

Abstract

Keywords

Cite

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