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MA: Fachverband Magnetismus
MA 24: Weyl Semimetals (joint session MA/TT)
MA 24.1: Vortrag
Dienstag, 10. März 2026, 14:00–14:15, POT/0361
Ferrimagnetism and the causes of discontinuous magnetic behavior in Kagome Weyl-semimetal Co3Sn2S2 — •Abdul-Vakhab Tcakaev1, Benjamin Katter1, Stefan Enzner2, Eugen Weschke3, Sebastian Wintz3, Gohil S. Thakur4, Michael Ruck4, Giorgio Sangiovanni2, and Vladimir Hinkov1 — 1Experimentelle Physik IV, Fakultät für Physik und Astronomie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Computational Quantum Materials, Fakultät für Physik und Astronomie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 3Helmholtz-Zentrum Berlin for Materials and Energy, Albert-Einstein-Straße 15, 12489 Berlin, Germany — 4Technical University of Dresden, Helmholtzstr. 10 01069 Dresden
The Kagome Weyl semimetal Co3Sn2S2 shows puzzling magnetic anomalies that have been interpreted as hidden phase transitions. Combining element-specific XMCD, SQUID magnetometry, STXM, DFT, and inelastic neutron scattering, we establish a ferrimagnetic ground state in which Co moments are partially compensated by antiparallel Sn moments and stabilized by strong uniaxial magnetocrystalline anisotropy. Temperature-dependent XMCD and STXM show that the discontinuous drop of remanent magnetization on zero-field warming arises from abrupt domain nucleation controlled by demagnetization effects, rather than from an intrinsic change of the spin structure. This yields a consistent microscopic picture of the magnetism in Co3Sn2S2 relevant for its Weyl and anomalous Hall properties.
Keywords: Weyl semimetal; Kagome; topological insulator; magnetism; xmcd