Spin Thermal Hall Conductivity of a Kagome Antiferromagnet
Spin Thermal Hall Conductivity of a Kagome Antiferromagnet
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DOI：
10.1103/physrevlett.121.097203
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发表时间：
2018-08-29
影响因子：
8.6
通讯作者：
Yamashita, Minoru
中科院分区：
文献类型：
--
作者：
Doki, Hayato;Akazawa, Masatoshi;Yamashita, Minoru
在S = 1/2 kagome反铁磁体钙粉石[CaCu3(OH)(6)Cl-2中心点0.6H(2)O]的自旋液相中观察到明显的热霍尔信号（kappa(xy)）。我们发现，在Dzyaloshinskii-Moriya相互作用D/J接近0.1的情况下，使用Schwinger-boson平均场理论，kappa（xy）在定性和定量上都得到了很好的再现。特别是，Ca kapellasite的kappa（xy）值和另一种kagome反铁磁体volborthite的kappa（xy）值在使用Schwinger玻色子模拟时收敛到一条曲线上，表明kagome反铁磁体的自旋与kappa（xy）有共同的温度依赖性。
A clear thermal Hall signal (kappa(xy)) was observed in the spin-liquid phase of the S = 1/2 kagome antiferromagnet Ca kapellasite [CaCu3(OH)(6)Cl-2 center dot 0.6H(2)O]. We found that kappa(xy) is well reproduced, both qualitatively and quantitatively, using the Schwinger-boson mean-field theory with the Dzyaloshinskii-Moriya interaction of D/J similar to 0.1. In particular,kappa(xy) values of Ca kapellasite and those of another kagome antiferromagnet, volborthite, converge to one single curve in simulations modeled using Schwinger bosons, indicating a common temperature dependence of kappa(xy) for the spins of a kagome antiferromagnet.