Quantum phase transition induced by Dzyaloshinskii-Moriya interactions in the kagome antiferromagnet

被引：179

作者：

Cepas, O. ^{[1
]}

Fong, C. M. ^{[2
]}

Leung, P. W. ^{[2
]}

Lhuillier, C. ^{[1
]}

机构：

[1] Univ Paris 06, CNRS, Lab Phys Theor Mat Condensee, UMR7600, F-75252 Paris 05, France

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

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.78.140405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We argue that the S=1/2 kagome antiferromagnet undergoes a quantum phase transition when the Dzyaloshinskii-Moriya coupling is increased. For D < D-c the system is in a moment-free phase, and for D>D-c the system develops antiferromagnetic long-range order. The quantum critical point is found to be D-c similar or equal to 0.1J using exact diagonalizations and finite-size scaling. This suggests that the kagome compound ZnCu3(OH)(6)Cl-3 may be in a quantum critical region controlled by this fixed point.

引用

页数：4

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