Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Correlated Magnetism – General
TT 3.4: Vortrag
Montag, 17. März 2025, 10:15–10:30, H32
Detection of skyrmion lattices by dilatometric measurements — •Mathias Doerr1, Justus Grumbach1, Sergey Granovsky1, Martin Rotter1, and Max Hirschberger2,3 — 1Technische Universität Dresden, Institut für Festkörper- und Materialphysik, 01062 Dresden, Germany — 2Department of Applied Physics and Quantum-Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan — 3RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
Magnetic skyrmion lattices (SkL) with a characteristic structure size smaller than 3 nm in metallic Gd3Ru4Al12 with a planar breathing kagome lattice, already demonstrated by X-ray diffraction and topological Hall effect studies 1, open up new possibilities for the effective transmission of information. The interplay between helically determined skyrmion patterns and underlying crystallographic structures offers the possibility to clearly determine the stability region of skyrmions by dilatometric measurements. We report high-precision measurements of magnetostriction and thermal expansion on Gd3Ru4Al12 and construct the magnetic phase diagram. Additional MonteCarlo simulations with McPhase confirm an asymmetric magnetic triple-q structure without symmetry breaking at the ordering temperature. The relationship between crystallographic distortion and formation of the SkL is also discussed.
[1] M. Hirschberger et al., Nat. Commun. 10, 5831 (2019).
Keywords: skyrmion lattice; magnetostriction; magnetic phase diagram