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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.13: Poster

Tuesday, March 28, 2023, 17:00–19:00, P1

muSR on single crystals of GaV4S8 — •Elaheh Sadrollahi^1,2, Andre Borchers², Jochen Litterst^2,3, Isván Kézsmárki⁴, Sandor Bordacs⁵, Vladimir Tsurkan⁴, and Alois Loidl⁴ — ¹Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany — ²Institut für Physik der kondensierten Materie, Technische Universität Braunschweig, 38110 Braunschweig, Germany — ³Centro Brasileiro de Pesquisas Físicas, 22290-180, Rio de Janeiro, RJ, Brazil — ⁴Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany — ⁵Department of Physics, Budapest University of Technology and Economics, 1111 Budapest, Hungary

The lacunar thio-spinel GaV4S8 possesses a complex magnetic phase diagram with several magnetic phases in zero and applied field, in part with supposed cycloidal, ferromagnetic, and/or short-range cycloidal spin structures, eventually even including skyrmion structures in the ferromagnetic phase [1,2]. We have performed muon spin rotation and relaxation (muSR) experiments on oriented single crystals. In a zero magnetic field, the spontaneous rotation signals allow us to distinguish between the cycloidal (ca. 8-13 K) and the low temperature 'ferromagnetic' phase, yet with a smooth continuous transition extending over several degrees, which is interpreted with a spin-reorientation. The observed changes at low temperatures and in the applied field indicate that this phase has no simple ferromagnetic character. We will discuss the observed field distribution patterns under various applied fields.[1] I. Kezsmarki et al., Nature Mater. 14, 1116 (2015).[2] S.Widmann et al., unpubl., arXiv 1606.04511 (2016).