The spin gap in a quantum antiferromagnet on the kagome lattice

被引：20

作者：

Honda, Z ^{[1
]}

Katsumata, K

Yamada, K

机构：

[1] Saitama Univ, Fac Engn, Urawa, Saitama 3388570, Japan

[2] RIKEN, Harima Inst, Sayo, Hyogo 6795148, Japan

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2002年 / 14卷 / 38期

关键词：

D O I：

10.1088/0953-8984/14/38/101

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A new spin S = 1/2 antiferromagnet on the kagome lattice, [Cu-3(titmb)(2) (OCOCH3)(6)].H2O (titmb = 1 3, 5-tris(imidazol-1-ylmethyl)-2, 4, 6 trimethylbenzene), has been grown and its magnetic properties have been studied. We have found for the first time a two-peak feature in the temperature dependence of the heat capacity. The higher-temperature peak is explained as due to a short-range magnetic ordering in two dimensions. We analysed the lower-temperature peak on the basis of an energy level scheme with a singlet ground state and a spin gap to the first excited triplet. The analysis reproduces the experiment fairly well, suggesting that the ground state is a disordered quantum liquid.

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收藏

页码：L625 / L629

页数：5

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