Experiments on Haldane gap in quasi-one-dimensional antiferromagnets
Experiments on Haldane gap in quasi-one-dimensional antiferromagnets
复制标题
准一维反铁磁体中霍尔丹能隙的实验
DOI：
10.1016/s0304-8853(10)80074-5
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
M. Verdaguer
中科院分区：
文献类型：
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作者：
J. Renard;V. Gadet;L. Regnault;M. Verdaguer
本文综述了最近几个与理想的一维海森堡反铁磁体相接近的线性链状化合物的实验工作，其中包括Ni(C2H8N2)2NO2ClO4(NENP)和另外两个具有相似结构的Ni(II)化合物AgVP2S6和一个新的有希望的Ni(II)链Ni(NO2)3N(CH3)4(TMNIN)。所有这些化合物都表现出低温磁化率降低和缺乏三维长程磁序的特点，这是霍尔丹带隙的特征。重点讨论了大电场对NENP和TMNIN能级禁带的破坏，以及在NENP链中引入铜杂质的影响。
We review recent experimental works on several linear chain compounds which approximate the ideal one-dimensional Heisenberg antiferromagnet withS= 1. They include Ni(C2H8N2)2NO2ClO4(NENP) and two other Ni (II) compounds with similar structure, AgVP2S6and a new promising Ni (II) chain Ni(NO2)3N(CH3)4(TMNIN). All these compounds exhibit the low temperature susceptibility decrease and the absence of 3D long range magnetic order which are characteristic of the Haldane gap. We especially discuss the break of the gap induced by large applied fields in NENP and TMNIN and the effect of copper impurities introduced in the chains of NENP.