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Large Topological Hall Effect in a Short-Period Helimagnet MnGe

2011; American Physical Society; Volume: 106; Issue: 15 Linguagem: Inglês

10.1103/physrevlett.106.156603

1092-0145

Naoya Kanazawa, Y. Onose, T. Arima, Daisuke Okuyama, Kenji Ohoyama, Shuichi Wakimoto, Kazuhisa Kakurai, Shintaro Ishiwata, Yoshinori Tokura,

Magnetic and transport properties of perovskites and related materials

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.