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MA: Fachverband Magnetismus

MA 12: Skyrmions I

MA 12.5: Vortrag

Montag, 18. März 2024, 16:00–16:15, EB 301

Meron-antimeron lattice in Gd₂PdSi₃ and its topological Hall effect — •Leonie Spitz^1,2, Sebastian Esser³, Fehmi Sami Yasin², Kamil Kolincio², Takashi Kurumaji², Sonia Francoual⁴, Pablo Bereciartua⁴, Akiko Kikkawa², Yasujiro Taguchi², Xiuzhen Yu², Taka-hisa Arima^2,5, Yoshinori Tokura^2,3,6, and Max Hirschberger^2,3 — ¹Paul-Scherrer-Institut, Switzerland — ²RIKEN Center for Emergent Matter Science, Japan — ³Dept. of Applied Phys., The University of Tokyo, Japan — ⁴PETRA-III Synchrotron, DESY, Germany — ⁵Dept. of Adv. Materials Science, The University of Tokyo, Japan — ⁶Tokyo College, The University of Tokyo, Japan

Merons and antimerons are triple-q spin textures with winding number n = ± 1/2. Apart from the winding number, meron/antimeron lattices differ from a skyrmion lattice in the phase between their constituent helical spin-density waves [1]. A skyrmion lattice accompanied by a large topological Hall effect was found in the centrosymmetric frustrated triangular lattice magnet Gd₂PdSi₃ in a magnetic field [2]. We focused on the zero-field ground state of Gd₂PdSi₃ and identified its triple-q magnetic structure as a meron-antimeron lattice. We studied the characteristics of the transition between the meron-antimeron phase and the skyrmion phase in Gd₂PdSi₃ to elucidate which degree of freedom is driving the transition in this case [3].

[1] S. Hayami et al., Nat. Commun. 12, 6927 (2021) [2] T. Kurumaji et al., Science 365, 914-918 (2019) [3] L. Spitz et al., manuscript in preparation

Keywords: Meron; Antimeron; Skyrmion