Hall effect of spin-chirality origin in a triangular-lattice helimagnet Fe{1.3}Sb.
Hall effect of spin-chirality origin in a triangular-lattice helimagnet Fe{1.3}Sb.
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DOI：
10.1103/physrevlett.108.056601
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发表时间：
2011-10
影响因子：
8.6
通讯作者：
Y. Shiomi;M. Mochizuki;Y. Kaneko;Y. Tokura
中科院分区：
文献类型：
--
作者：
Y. Shiomi;M. Mochizuki;Y. Kaneko;Y. Tokura
本文报道了准二维螺旋磁Fe{1+δ} Sb中标量自旋手征可能引起的拓扑霍尔效应。（浓度δ ≥ 0.3）介于120°自旋有序三角形平面之间的平面趋于冻结，在外加磁场作用下，观察到与常规反常霍尔项符号相反的非平凡霍尔电阻率分量垂直于三角晶格平面。观察到的非常规霍尔效应归因于标量自旋手性所产生的七聚体自旋团簇周围的磁性铁网站，这可以引起的自旋调制的Dzyaloshinsky-Moriya相互作用。
We report on a topological Hall effect possibly induced by scalar spin chirality in a quasi-two-dimensional helimagnet Fe{1+δ}Sb. In the low-temperature region where the spins on interstitial-Fe (concentration δ∼0.3) intervening the 120° spin-ordered triangular planes tend to freeze, a nontrivial component of Hall resistivity with opposite sign of the conventional anomalous Hall term is observed under magnetic field applied perpendicular to the triangular-lattice plane. The observed unconventional Hall effect is ascribed to the scalar spin chirality arising from the heptamer spin clusters around the interstitial-Fe sites, which can be induced by the spin modulation by the Dzyaloshinsky-Moriya interaction.