Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Skyrmions III (joint session MA/TT)

MA 40.9: Talk

Wednesday, March 18, 2020, 17:15–17:30, POT 6

Band structure tuning of a skyrmion lattice with giant topological Hall effect — •Leonie Spitz², Max Hirschberger¹, Shang Gao¹, Taro Nakajima¹, Christian Pfleiderer², Taka-hisa Arima^1,3, and Yoshinori Tokura¹ — ¹RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wakoshi, Saitama 351-0198, Japan — ²Physik-Department, Technical University of Munich, 85748 Garching, Germany — ³Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

A skyrmion lattice accompanied by a large topological Hall effect was found for the centrosymmetric frustrated triangular lattice magnet Gd₂PdSi₃ [1]. In contrast to non-centrosymmetric compounds, the skyrmion spin-vortices reported for Gd₂PdSi₃ can not be stabilized by the Dzyaloshinskii-Moriya interaction, but rather by frustration and the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction [2-4]. The nanometer-scale size of the skyrmions in Gd₂PdSi₃ is a further novelty and may give rise to a very large emergent magnetic field B_em.

The project to be presented aims at a deeper understanding of the emergence of the giant topological Hall effect in Gd₂PdSi₃. In an extensive study we investigated the effect of isoelectronic doping on the topological Hall effect, the magnetic structure, and the band structure of the system.

[1] T. Kurumaji, et al., Science 365, 914-918 (2019) [2] T. Okubo, et al., Phys. Rev. Lett. 108, 017206 (2012) [3] A. O. Leonov, et al., Nat. Commun. 6, 8275 (2015) [4] S. Hayami, et al., Phys. Rev. B 95, 224424 (2017)