论文标题
电子掺杂的kagome磁铁Mn $ _3 $ sn
Higher order exchange driven noncoplanar magnetic state and large anomalous Hall effects in electron doped kagome magnet Mn$_3$Sn
论文作者
论文摘要
由于几何挫败感，Mn $ _3 $ SN展示了120美元$^{\ circ} $平面三角形反铁磁性（AFM）订单，具有大型异常效果（AHE）。在这里，我们提出了一项合并的理论和实验研究，以证明MN $ _3 $ SN中的平面内AFM结构可以通过合适的电子掺杂来显着修改为可调的非稳态磁态。在密度功能理论计算的帮助下，我们表明，系统中高阶交换相互作用的存在导致非稳定磁接地状态的稳定，这是由中子衍射研究进一步建立的，在Fe掺杂的MN $ _3 $ SN样本中。有趣的是，我们发现大型标量自旋手性（SSC）诱导的拓扑AHE可以通过非旋转性程度来显着调整。我们进行60 〜T磁性和霍尔电阻率测量，以证明SSC对观察到的AHE的贡献。我们还说明了系统中对双重顺序的同时操纵，在该方面，由面内120 $^{\ circ} $ Triangular AFM订单产生的AHE可以切换其符号而不会影响SSC生成的AHE。本研究为探索与多个阶的共存相关的新型量子现象打开了一个新的方向。
Owing to the geometrical frustration, Mn$_3 $Sn exhibits a 120$^{\circ}$ in-plane triangular antiferromagnetic (AFM) order with a large anomalous Hall effect (AHE). Here, we present a combined theoretical and experimental study to demonstrate that the in-plane AFM structure in Mn$_3 $Sn can be significantly modified to a tunable noncoplanar magnetic state by suitable electron doping. With the help of Density Functional Theory calculations we show that the presence of higher-order exchange interactions in the system leads to the stabilization of the noncoplanar magnetic ground state, which is further established by neutron diffraction study in the Fe-doped Mn$_3 $Sn sample. Interestingly, we find a large scalar spin chirality (SSC) induced topological AHE that can be significantly tuned with the degree of non-coplanarity. We carry out 60~T magnetic and Hall resistivity measurements to demonstrate the contribution of SSC to the observed AHE. We also illustrate a simultaneous manipulation of dual order in the system, where the AHE arising from the in-plane 120$^{\circ}$ triangular AFM order can switch its sign without affecting the AHE generated by the SSC. The present study opens up a new direction to explore novel quantum phenomena associated with the coexistence of multiple orders.
