title: Large topological Hall effect in a short-period helimagnet MnGe.
abstract: We have observed an unconventional, likely topological, Hall effect over a wide temperature region in the magnetization process of a chiral-lattice helimagnet MnGe. The magnitude of the topological Hall resistivity is nearly temperature-independent below 70 K, which reflects the real-space fictitious magnetic field proportional to a geometric quantity (scalar spin chirality) of the underlying spin texture. From the neutron diffraction study, it is anticipated that a relatively short-period (3-6 nm) noncoplanar spin structure is stabilized from the proper screw state in a magnetic field to produce the largest topological Hall response among the B20-type (FeSi-type) chiral magnets.
authors.affiliation: Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kanazawa
authors.forename: Y
authors.initials: Y
authors.lastname: Onose
authors.forename: T
authors.initials: T
authors.lastname: Arima
authors.forename: D
authors.initials: D
authors.lastname: Okuyama
authors.forename: K
authors.initials: K
authors.lastname: Ohoyama
authors.forename: S
authors.initials: S
authors.lastname: Wakimoto
authors.forename: K
authors.initials: K
authors.lastname: Kakurai
authors.forename: S
authors.initials: S
authors.lastname: Ishiwata
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura