Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 53: Magnetic Heuslers, half-metals and oxides

MA 53.7: Vortrag

Freitag, 5. April 2019, 11:00–11:15, H33

Observation of topological Hall effect in antiskyrmion hosting compound Mn1.4PtSn — •Praveen Vir¹, Jacob Gayles¹, Alexandr Sukhanov¹, Nitesh Kumar¹, Yan Sun¹, Jürgen Kübler², Chandra Shekhar¹, and Claudia Felser¹ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²Nöthnitzer Str. 40

Skyrmions are topologically stable vortex-like spin structure which are considered as a potential candidate for future high-density memory devices. They have been detected in many chiral and polar compounds. Recently, antiskyrmions, the antiparticle of skyrmions[1], have been discovered in Mn1.4PtSn and Mn1.4Pt0.9Pd0.1Sn[2]. Due to topological charge, it can give rise to nonzero topological Hall Effect (THE). We have synthesized the single crystals of Mn1.4PtSn and measured its directional dependent magnetic and transport properties. By means of powder neutron diffraction measurement, a noncoplanar spin structure was found at low temperature. In the noncoplanar magnetic region, we found a large anisotropic THE, which has possibly a topological origin. We show for the first time that THE has contributions both from real and momentum-space Berry phase.