Topological thermal Hall effect in frustrated kagome antiferromagnets
Topological thermal Hall effect in frustrated kagome antiferromagnets
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DOI：
10.1103/physrevb.95.014422
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发表时间：
2016-08
影响因子：
3.7
通讯作者：
S. Owerre
中科院分区：
文献类型：
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作者：
S. Owerre
在阻挫磁体中，由自旋轨道耦合引起的Dzyaloshinsky-Moriya相互作用可以诱导磁长程有序。本文报道了可果美阻挫磁体KCr 3（OH）6（SO 4）2和KFe 3（OH）6（SO 4）2的热霍尔效应的理论预测。这些材料中的热霍尔效应是由标量自旋手性引起的，而不是以前研究中的自旋手性。标量自旋手征性起源于非共面自旋织构引起的磁场诱导手征自旋组态，但一般来说，手征自旋手征性可以自发地发展为手征量子自旋液体的宏观序参量。因此，我们推断，有一个热霍尔效应的可能性，阻挫kagome磁体，如herbertsmithite ZnCu$_3$（OH）$_6$Cl$_2$和铬化合物Ca$_{10}$Cr$_7$O$_{28}$，虽然他们也显示出磁秩序在磁场或压力的存在下的证据。
In frustrated magnets the Dzyaloshinsky-Moriya interaction arising from spin-orbit coupling can induce a magnetic long-range order. Here, we report a theoretical prediction of thermal Hall effect in frustrated kagome magnets such as KCr$_3$(OH)$_6$(SO4)$_2$ and KFe$_3$(OH)$_{6}$(SO$_{4}$)$_2$. The thermal Hall effects in these materials are induced by scalar spin chirality as opposed to DMI in previous studies. The scalar spin chirality originates from magnetic-field-induced chiral spin configuration due to non-coplanar spin textures, but in general it can be spontaneously developed as a macroscopic order parameter in chiral quantum spin liquids. Therefore, we infer that there is a possibility of thermal Hall effect in frustrated kagome magnets such as herbertsmithite ZnCu$_3$(OH)$_6$Cl$_2$ and the chromium compound Ca$_{10}$Cr$_7$O$_{28}$, although they also show evidence of magnetic order in the presence of a magnetic field or pressure.