title: Hall effect of spin-chirality origin in a triangular-lattice helimagnet Fe{1.3}Sb.
abstract: 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.
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Shiomi
authors.forename: M
authors.initials: M
authors.lastname: Mochizuki
authors.forename: Y
authors.initials: Y
authors.lastname: Kaneko
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura