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arXiv 1810.04867cond-mat.str-elcond-mat.mtrl-scicond-mat.other
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磁性Weyl半金属Co $_{3}$ Sn $_{2}$ S $_{2}$中的平面霍尔效应观察

Observation of planar Hall effect in the magnetic Weyl semimetal Co$_{3}$Sn$_{2}$S$_{2}$

Shama, R. K. Gopal, Yogesh Singh

摘要:

我们报告详细的磁性Weyl半金属Co $_{3}$ Sn $_{2}$ S $_{2}$单晶的磁输运测量。最近,在这种材料中观察到了大的反常霍尔效应和手性反常,这被认为与外尔点之间的大Berry曲率有关(Liu等人,Nature Physics(2018).)。预期由磁性Weyl材料的拓扑能带结构产生的另一效应是平面霍尔效应(PHE)。在这项工作中,我们报告观察到的本征效应在单晶的Co $_{3}$ Sn $_{2}$ S $_{2}$。重要的是,在温度$T \leq 74$ ~K下观察到PHE,该温度远小于铁磁有序温度$T_c = 175$ ~K。结合大的反常霍尔电导率,进一步证明了Co $_3$ Sn $_2$ S $_2$的拓扑特征.

英文摘要:

We report detailed magneto-transport measurements on single crystals of the magnetic Weyl semi-metal Co$_{3}$Sn$_{2}$S$_{2}$. Recently a large anomalous Hall effect and chiral anomaly have been observed in this material which have been suggested to be related to the large Berry curvature between the Weyl points (Liu et al., Nature Physics (2018).). Another effect expected to result from the topological band structure of magnetic Weyl materials is the planar Hall effect (PHE). In this work we report observation of this intrinsic effect in single crystals of Co$_{3}$Sn$_{2}$S$_{2}$. Crucially, the PHE is observed for temperature $T \leq 74$~K which is much smaller than the ferromagnetic ordering temperature $T_c = 175$~K\@. Together with the large anomalous Hall conductivity, this further demonstrates the Topological character of Co$_3$Sn$_2$S$_2$.

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