Spin dynamics and orbital state in LaTiO3

被引：192
作者：
Keimer, B [1 ]
Casa, D
Ivanov, A
Lynn, JW
von Zimmermann, M
Hill, JP
Gibbs, D
Taguchi, Y
Tokura, Y
机构：
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[2] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[4] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[5] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[6] Univ Tokyo, Dept Appl Phys, Tokyo 113, Japan
来源：
PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 18期
关键词：
D O I：
10.1103/PhysRevLett.85.3946
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页码：3946 / 3949
页数：4
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