Magnon dispersion and anisotropies in SrCu2(BO3)2

被引：22

作者：

Cheng, Y. F. ^{[1
]}

Cepas, O.

Leung, P. W.

Ziman, T.

机构：

[1] Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Hong Kong, Peoples R China

[2] Univ Paris 06, CNRS, UMR 7600, Lab Phys Theor Mat Condensee, Paris, France

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.75.144422

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the dispersion of the magnons (triplet states) in SrCu2(BO3)(2) including all symmetry-allowed Dzyaloshinskii-Moriya interactions [J. Phys. Chem. Solids 4, 241 (1958); Phys. Rev. 120, 91 (1960)]. We can reduce the complexity of the general Hamiltonian to a simpler form by appropriate rotations of the spin operators. The resulting Hamiltonian is studied by both perturbation theory and exact numerical diagonalization on a 32-site cluster. We argue that the dispersion is dominated by Dzyaloshinskii-Moriya interactions. We point out which combinations of these anisotropies affect the dispersion to linear order, and extract their magnitudes.

引用

页数：10

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