论文标题
由异常效应引起的磁转移
Magnetotransport induced by anomalous Hall effect
论文作者
论文摘要
在磁性金属中，通常认为大厅的电阻为普通大厅电阻和异常的大厅电阻的总和。在这里表明，当普通霍尔角或异常的霍尔角度不小时，这种经验关系不再有效。使用适当的电导率关系，我们揭示了由异常效应（AHE）引起的意外磁力（MR）。 A $ b $ - 线性先生出现，坡度的迹象取决于异常的大厅角度的迹象，从而产生了特征性的Bowtie形状。单频系统中的大厅电阻可以表现出非线性，通常被认为是两波段系统的特征。 A $ b $ - 对称组件出现在大厅中。这些效果反映了普通大厅效应和AHE之间的根本差异。此外，我们在实验中重现了以前在Co $ _3 $ sn $ _2 $ s $ _2 $中报道的异常MR和HALL，并表明这些观察结果可以通过拟议的机制很好地解释。 MR经常在量子异常的霍尔绝缘子中观察到，可以进一步确认图片。该效果还可以解释在非磁性三维拓扑狄拉克半学中观察到的大MR。
In a magnetic metal, the Hall resistance is generally taken to be the sum of the ordinary Hall resistance and the anomalous Hall resistance. Here it is shown that this empirical relation is no longer valid when either the ordinary Hall angle or the anomalous Hall angle is not small. Using the proper conductivity relation, we reveal an unexpected magnetoresistance (MR) induced by the anomalous Hall effect (AHE). A $B$-linear MR arises and the sign of the slope depends on the sign of the anomalous Hall angle, giving rise to a characteristic bowtie shape. The Hall resistance in a single-band system can exhibit a nonlinearity which is usually considered as a characteristic of a two-band system. A $B$-symmetric component appears in the Hall. These effects reflect the fundamental difference between the ordinary Hall effect and the AHE. Furthermore, we experimentally reproduce the unusual MR and Hall reported before in Co$_3$Sn$_2$S$_2$ and show that these observations can be well explained by the proposed mechanism. MR often observed in quantum anomalous Hall insulators provides further confirmation of the picture. The effect may also account for the large MR observed in non-magnetic three-dimensional topological Dirac semimetals.
