Magnetic Properties of the Spin-1/2 Deformed Kagome Antiferromagnet Edwardsite
Magnetic Properties of the Spin-1/2 Deformed Kagome Antiferromagnet Edwardsite
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DOI：
10.7566/jpsj.82.063710
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发表时间：
2013-05
期刊：
影响因子：
--
通讯作者：
H. Ishikawa;Y. Okamoto;Z. Hiroi
中科院分区：
文献类型：
--
作者：
H. Ishikawa;Y. Okamoto;Z. Hiroi
制备了一种新的自旋为1/2的kagome反铁磁体候选化合物Cd_2Cu_3（SO_4）_2（OH）_6·4H_2O的粉末样品，通过磁化率和热容测量研究了其磁性. Edwardsite具有变形的kagome晶格，附近自旋之间的平均反铁磁相互作用为51 K，并显示出反铁磁有序，伴随着低于4.3 K的小铁磁矩。弱铁磁性可能是由于相当大的Dzyaloshinsky-Moriya相互作用引起的自旋倾斜，这可能会稳定长程磁序，而不是预期的自旋液体状态。
We prepared a powder sample of edwardsite Cd2Cu3(SO4)2(OH)6 4H2O, which is a new candidate compound for the spin-1/2 kagome antiferromagnet, and studied its magnetic properties by magnetic susceptibility and heat capacity measurements. Edwardsite has a deformed kagome lattice with an average antiferromagnetic interaction of 51 K between nearby spins and shows an antiferromagnetic order accompanied by a small ferromagnetic moment below 4.3 K. The weak ferromagnetism is likely due to spin canting caused by sizable Dzyaloshinsky-Moriya interactions, which may stabilize the long-range magnetic order instead of a spin-liquid state expected for the kagome antiferromagnet.