Magnetic ground state of an experimental S=1/2 kagome antiferromagnet

被引：162

作者：

de Vries, M. A. ^{[1
]}

Kamenev, K. V. ^{[1
]}

Kockelmann, W. A. ^{[2
]}

Sanchez-Benitez, J. ^{[1
]}

Harrison, A. ^{[1
,3
]}

机构：

[1] Univ Edinburgh, CSEC, Edinburgh EH9 3JZ, Midlothian, Scotland

[2] ISIS, STFC, Rutherford Appleton Lab, Didcot OX11 0QK, Oxon, England

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

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 15期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.100.157205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a detailed analysis of the heat capacity of a near-perfect S=1/2 kagome antiferromagnet, zinc paratacamite ZnxCu4-x(OH)(6)Cl-2, as a function of stoichiometry x -> 1 and for fields of up to 9 T. We obtain the heat capacity intrinsic to the kagome layers by accounting for the weak Cu2+/Zn2+ exchange between the Cu and the Zn sites, which was measured independently for x=1 using neutron diffraction. The evolution of the heat capacity for x=0.8...1 is then related to the hysteresis in the magnetic susceptibility. We conclude that for x > 0.8 zinc paratacamite is a spin liquid without a spin gap, in which unpaired spins give rise to a macroscopically degenerate ground state manifold with increasingly glassy dynamics as x is lowered.

引用

页数：4

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