Spin dynamics of the quasi-two-dimensional spin-1/2 quantum magnet Cs2CuCl4 -: art. no. 134429

被引：40

作者：

Veillette, MY ^{[1
]}

James, AJA ^{[1
]}

Essler, FHL ^{[1
]}

机构：

[1] Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3NP, England

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.72.134429

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study dynamical properties of the anisotropic triangular quantum antiferromagnet Cs2CuCl4. Inelastic neutron scattering measurements have established that the dynamical spin correlations cannot be understood within a linear spin wave analysis. We go beyond linear spin wave theory by taking interactions between magnons into account in a 1/S expansion. We determine the dynamical structure factor and carry out extensive comparisons with experimental data. We find that compared to linear spin wave theory, a significant fraction of the scattering intensity is shifted to higher energies and strong scattering continua are present. However, the 1/S expansion fails to account for the experimentally observed large quantum renormalization of the exchange energies.

引用

页数：13

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