Vesignieite BaCu3V2O8(OH)2 as a Candidate Spin-1/2 Kagome Antiferromagnet
Vesignieite BaCu3V2O8(OH)2 as a Candidate Spin-1/2 Kagome Antiferromagnet
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DOI：
10.1143/jpsj.78.033701
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发表时间：
2009-03-01
影响因子：
1.7
通讯作者：
Hiroi, Zenji
中科院分区：
文献类型：
--
作者：
Okamoto, Yoshihiko;Yoshida, Hiroyuki;Hiroi, Zenji
合成了一种由自旋为1/2的Cu ~（2+）离子组成的近理想kagome晶格的多晶钙镁矾BaCu_3V_2 O_8（OH）（2）样品，并对其进行了磁化强度和热容测量。磁化率显示既没有长程有序，自旋玻璃化转变，也没有自旋间隙下降到2 K，尽管最近邻自旋之间的J/k（B）= 53 K的中等强的反铁磁相互作用。在对应于0.4J内禀磁化率的温度下观察到的宽峰表明短程有序的显着发展。Vesignicite的基态可能是一个无隙的自旋液体或伴随着一个非常小的间隙小于类似J/30。
A polycrystalline sample of vesignicite BaCu3V2O8(OH)(2) comprising a nearly ideal kagome lattice composed of Cu2+ ions carrying spin 1/2 has been synthesized and studied by magnetization and heat capacity measurements. Magnetic susceptibility shows a neither long range order, a spin glass transition nor a spin gap down to 2 K, in spite of a moderately strong antiferromagnetic interaction of J/k(B) = 53 K between nearest-neighbor spins. A broad peak observed at a temperature corresponding to 0.4J in intrinsic magnetic Susceptibility indicates a marked development of the short-range order. The ground state of vesignicite is probably a gapless spin liquid or is accompanied by a very small gap less than similar to J/30.