Exceptionally large anomalous Hall effect due to anticrossing of spin-split bands in the antiferromagnetic half-Heusler compound TbPtBi
Exceptionally large anomalous Hall effect due to anticrossing of spin-split bands in the antiferromagnetic half-Heusler compound TbPtBi
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DOI：
10.1103/physrevb.101.161105
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发表时间：
2020-03
影响因子：
3.7
通讯作者：
Yanglin Zhu;Bahadur Singh;Yu Wang;Cheng-Yi Huang;Wei-Chi Chiu;Baokai Wang;D. Graf;Yubo Zhang;Hsin Lin;Jianwei Sun;A. Bansil;Z. Mao
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文献类型：
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作者：
Yanglin Zhu;Bahadur Singh;Yu Wang;Cheng-Yi Huang;Wei-Chi Chiu;Baokai Wang;D. Graf;Yubo Zhang;Hsin Lin;Jianwei Sun;A. Bansil;Z. Mao
我们研究了半Heusler化合物TbPtBi的磁输运性质和拓扑电子结构。我们的实验揭示了一个异常大的反常霍尔效应（AHE）在倾斜的反铁磁态的TbPtBi与反常霍尔角达到$\ensuremath{\sim}0.68\ensuremath{-}0.76$，这是几倍大于以前报道的记录在GdPtBi.第一性原理的电子结构和相关的异常霍尔电导率进行了计算，以解释实验结果。我们的分析表明，TbPtBi中的AHE并不是起源于外尔点，而是由TbPtBi中费米能级附近的自旋分裂带的反交叉产生的大净Berry曲率驱动的。
We have investigated the magnetotransport properties and the topological electronic structure of the half-Heusler compound TbPtBi. Our experiments reveal an exceptionally large anomalous Hall effect (AHE) in the canted antiferromagnetic state of TbPtBi with the anomalous Hall angle reaching $\ensuremath{\sim}0.68\ensuremath{-}0.76$, which is a few times larger than the previously reported record in GdPtBi. First-principles electronic structure and the associated anomalous Hall conductivity were computed in order to interpret the experimental results. Our analysis shows that the AHE in TbPtBi does not originate from the Weyl points but that it is driven by the large net Berry curvature produced by the anticrossing of spin-split bands near the Fermi level in TbPtBi.