Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Skyrmions III (joint session MA/TT)

TT 45.9: Vortrag

Mittwoch, 18. März 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 Arima1,3, and Yoshinori Tokura11RIKEN 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 Bem.

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)

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