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.

引用

页码：3946 / 3949

页数：4

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