论文标题
观察磁性Weyl Semimetal Co $ _3 $ sn $ _2 $ S $ _2 $
Observation of an unexpected negative magnetoresistance in magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$
论文作者
论文摘要
时间反转对称性破坏允许与电子拓扑相关的丰富的磁通属性属性。专注于磁性Weyl Semimetal Co $ _3 $ sn $ _2 $ s $ _2 $，我们准备了微孔，并调查了其横向和纵向运输属性从100 k到180 k的磁场$μ_0h $，最高为2t。我们建立了高达1％的磁化率（MR），其各向异性均具有强大的各向异性，具体取决于易于轴磁化的$ h $的投影，这超过了所有其他磁性效应。基于详细的现象学建模，我们将观察到的结果以各向异性的意外形式归因于镁电子偶联导致的镁MR。此外，在横向电阻率中也发现了类似的角度依赖性，我们表明，这起源于普通大厅和异常霍尔效应的组合。因此，磁性和拓扑特性的相互作用控制着该磁性Weyl系统的磁转运特征。
Time-reversal symmetry breaking allows for a rich set of magneto-transport properties related to electronic topology. Focusing on the magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$, we prepared micro-ribbons and investigated their transverse and longitudinal transport properties from 100 K to 180 K in magnetic fields $μ_0 H$ up to 2T. We establish the presence of a magnetoresistance (MR) up to 1 % with a strong anisotropy depending the projection of $H$ on the easy-axis magnetization, which exceeds all other magnetoresistive effects. Based on detailed phenomenological modeling, we attribute the observed results with unexpected form of anisotropy to magnon MR resulting from magnon-electron coupling. Moreover, a similar angular dependence is also found in the transverse resistivity which we show to originate from the combination of ordinary Hall and anomalous Hall effects. Thus the interplay of magnetic and topological properties governs the magnetotransport features of this magnetic Weyl system.
