Emergence of topological Hall effect from fanlike spin structure as modified by Dzyaloshinsky-Moriya interaction in MnP
Emergence of topological Hall effect from fanlike spin structure as modified by Dzyaloshinsky-Moriya interaction in MnP
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DOI：
10.1103/physrevb.86.180404
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发表时间：
2012-11-15
影响因子：
3.7
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
--
作者：
Shiomi, Y.;Iguchi, S.;Tokura, Y.
在一个典型的流动helimnet MnP磁化过程中，观察到一个非平凡的霍尔效应是霍尔电导率的异常。由于Dzyaloshinsky-Moriya相互作用轻微地调节了自旋结构，因此只能在具有有限标量自旋手性的特定磁相（扇形）中识别异常。掺杂Co所观察到的异常幅度的减小可以很好地解释为实际空间中自旋手性诱导的Berry相引起的拓扑霍尔效应。在实际空间中估计一个虚拟的磁通量近似于1 T，这与自旋结构的小调制一致。
A nontrivial Hall effect has been observed as an anomaly of the Hall conductivity in the magnetization process in a typical itinerant helimagnet MnP. Since the Dzyaloshinsky-Moriya interaction slightly modulates the spin structure, the anomaly is identified only in the specific magnetic (fanlike) phase that can have finite scalar spin chirality. The decrease in the magnitude of the anomaly as observed by doping Co is well accounted for in terms of the topological Hall effect arising from the spin-chirality-induced Berry phase in real space. A fictitious magnetic flux in real space is estimated to be similar to 1 T, which is consistent with the small modulation of the spin structure.