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arXiv · 1110.5554

Hall effect of spin-chirality origin in a triangular-lattice helimagnet Fe1.3Sb

Y. Shiomi·M. Mochizuki·Y. Kaneko·Y. Tokura
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Abstract

We report on a topological Hall effect possibly induced by scalar spin chirality in a quasi-two- dimensional helimagnet Fe$_{1+x}$Sb. In the low-temperature region where the spins on interstitial- Fe (concentration $x=0.3$) intervening the $120^\circ$ spin-ordered triangular planes tend to freeze, a non-trivial 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.

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Y. Shiomi, M. Mochizuki, Y. Kaneko, Y. Tokura. 2011-10-25. Hall effect of spin-chirality origin in a triangular-lattice helimagnet Fe1.3Sb. https://doi.org/10.1103/physrevlett.108.056601

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