Chiral spin order in some purported Kitaev spin-liquid compounds
Chiral spin order in some purported Kitaev spin-liquid compounds
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DOI：
10.1103/physrevb.98.205110
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发表时间：
2018-07
影响因子：
3.7
通讯作者：
K. Modic;B. Ramshaw;A. Shekhter;C. Varma
中科院分区：
文献类型：
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作者：
K. Modic;B. Ramshaw;A. Shekhter;C. Varma
我们研究了最近在两种化合物γ-Li 2 IrO 3和RuCl 3中的磁矩测量，这两种化合物已经被讨论为Kitaev模型的可能实现。当外部磁场在两种晶体的c轴上旋转时，对扭矩不连续性的分析表明，它们在基态时具有一个不变的手性自旋序，形式为0，并且在很宽的磁场和温度范围内持续存在。一个非凡|B| B2依赖性的扭矩小领域，旁边通常的B2部分，预测的手征自旋顺序。对于γ− Li 2 IrO 3，小磁场的数据是可用的，并且在进一步分析后发现与预测一致。其他实验，如非弹性散射和热霍尔效应和几个问题提出的发现手征自旋秩序，包括其拓扑后果，进行了讨论。
We examine recent magnetic torque measurements in two compounds, γ−Li2IrO3 and RuCl3, which have been discussed as possible realizations of the Kitaev model. The analysis of the reported discontinuity in torque, as an external magnetic field is rotated across the c axis in both crystals, suggests that they have a translationally invariant chiral spin order of the form ⟨Si⋅(Sj×Sk)⟩≠0 in the ground state and persisting over a very wide range of magnetic field and temperature. An extraordinary |B|B2 dependence of the torque for small fields, beside the usual B2 part, is predicted by the chiral spin order. Data for small fields are available for γ−Li2IrO3 and are found to be consistent with the prediction upon further analysis. Other experiments such as inelastic scattering and thermal Hall effect and several questions raised by the discovery of chiral spin order, including its topological consequences, are discussed.