External magnetic field effects on a distorted kagome antiferromagnet.
External magnetic field effects on a distorted kagome antiferromagnet.
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DOI：
10.1103/physrevlett.101.107201
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发表时间：
2008-06
影响因子：
8.6
通讯作者：
Kim Jh;Sungdae Ji;Seunghun Lee;B. Lake;T. Yildirim;Hiroyuki Nojiri;H. Kikuchi;K. Habicht;Yiming Qiu;Klaus Kiefer
中科院分区：
文献类型：
--
作者：
Kim Jh;Sungdae Ji;Seunghun Lee;B. Lake;T. Yildirim;Hiroyuki Nojiri;H. Kikuchi;K. Habicht;Yiming Qiu;Klaus Kiefer
我们报告体磁化强度，和弹性和非弹性中子散射测量下的外磁场H弱耦合扭曲kagome系统，Cu2（OD）3Cl。结果表明，在6.7 K以下的有序态是一个倾斜的反铁磁态，由大的反铁磁ac分量和小的铁磁B分量组成.通过第一性原理计算和线性自旋波分析，我们提出了一个简单的自旋哈密顿量与非均匀的最近邻交换相互作用，导致一个系统的耦合自旋三聚体与单离子各向异性，可以定性地再现自旋动力学的Cu2（OD）3Cl。
We report bulk magnetization, and elastic and inelastic neutron scattering measurements under an external magnetic field H on the weakly coupled distorted kagome system, Cu2(OD)3Cl. Our results show that the ordered state below 6.7 K is a canted antiferromagnet and consists of large antiferromagnetic ac components and smaller ferromagnetic b components. By first-principles calculations and linear spin wave analysis, we present a simple spin Hamiltonian with nonuniform nearest neighbor exchange interactions resulting in a system of coupled spin trimers with a single-ion anisotropy that can qualitatively reproduce the spin dynamics of Cu2(OD)3Cl.