Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 53: Skyrmions IV
MA 53.1: Vortrag
Freitag, 22. März 2024, 09:30–09:45, EB 301
Putative formation of an antiferromagnetic Skyrmion lattice in J2-frustrated spinel compounds MnSc2X4 (X=S, Se) — •Justus Grumbach1, Mahmoud Deeb1, Andreas Hauspurg1, 2, Sergey Granovsky1, Sergei Zherlitsin2, and Mathias Doerr1 — 1Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01069 Dresden, Germany — 2Hochfeld-Magnetlabor Dresden (HLD), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
Spinels are a superposition of a pyrochlor and a diamond substructure. In the case of MnSc2X4 the magnetic Mn3+-ions form the diamond substructure with a dominant second nearest neighbour-exchange (J2>J1), which leeds to magnetic frustration. New magnetic phase diagrams could be deduced by magnetoelastic measurements for both compounds. For MnSc2S4 in H||[111] an antiferromagnetic skyrmion-lattice could be found in a broad region between 5T and 8T, up to 2K, confirming former INS-measurements and simulations. Furthermore, the skyrmionic phase could be reproduced by a new simulation based on thermodynamics, connected to the experiments. Otherwise, measurements of MnSc2Se4 as well as the resulting phase diagram clearly show no hints for a skyrmionic phase.
A comparison of dilatometry measurements and resulting phase diagrams with special consideration of the skyrmion-lattice will be the main message of the talk.
Keywords: Thermodynamics; Frustration; Spinel; Dilatometry; Skyrmions