Refining the Spin Hamiltonian in the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu3(OH)6Cl2 Using Single Crystals

被引：81

作者：

Han, Tianheng ^{[1
]}

Chu, Shaoyan ^{[2
]}

Lee, Young S. ^{[1
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 15期

关键词：

STATE;

D O I：

10.1103/PhysRevLett.108.157202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report thermodynamic measurements of the S = 1/2 kagome lattice antiferromagnet ZnCu3(OH)(6)Cl-2, a promising candidate system with a spin-liquid ground state. Using single crystal samples, the magnetic susceptibility both perpendicular and parallel to the kagome plane has been measured. A small, temperature-dependent anisotropy has been observed, where x(z)/x(p) > 1 at high temperatures and x(z)/x(p) < 1 at low temperatures. Fits of the high-temperature data to a Curie-Weiss model also reveal an anisotropy. By comparing with theoretical calculations, the presence of a small easy-axis exchange anisotropy can be deduced as the primary perturbation to the dominant Heisenberg nearest neighbor interaction. These results have great bearing on the interpretation of theoretical calculations based on the kagome Heisenberg antiferromagnet model to the experiments on ZnCu3(OH)(6)Cl-2.

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页数：5

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