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Spin Dynamics and Orbital State in LaTiO_3

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arxiv cond-mat/0002014 v2 pith:7SP4IQI4 submitted 2000-02-01 cond-mat.str-el

B. Keimer , D. Casa , A. Ivanov , J.W. Lynn , M. v. Zimmermann , J.P. Hill , D. Gibbs , Y. Taguchi
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Y. Tokura
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classification cond-mat.str-el
keywords orbitallatiospinscatteringspectrumwaveabsenceangular
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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$_{3}$.

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