Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 7: Poster Magnetism I

MA 7.37: Poster

Monday, March 9, 2026, 09:30–12:30, P2

Synthesis, characterization and magnetic properties of selected Shandites compounds — •Mervenur Keles, Ahmad Omar, Christian G. F. Blum, Dmitriy Efremov, Bernd Büchner, and Sabine Wurmehl — Leibniz Institute for Solid State and Materials Research, Helmholtzstraße 20, Dresden, 01069, Germany

Shandite-type Co3M2X2 (M: In, Sn, Pb, Tl; X: S, Se), with a unique Kagome lattice structure, serves as a model system for studying the interaction between structure, magnetism, topology, and electronic correlation. Some shandite compounds are magnetic Weyl semimetals that exhibit unconventional transport phenomena. However, the physical properties are strongly dependent on the stoichiometry and sample quality, which are rather difficult to achieve as-desired along with high reproducibility. To address this, we investigate multiple synthesis and crystal-growth routes for selected Co3M2X2 compounds, performing comprehensive structural, chemical, transport, and magnetic characterization. We present correlations between the synthesis route, resulting structure/stoichiometry, and observed physical properties. Through DFT calculations and ARPES measurements done in collaboration, we further investigate the band structure of these potential Co3M2X2 Kagome semimetals, with the aim to establish key parameters for topological band formation and magnetic order, and thus validate a Weyl Type III semimetal.

Keywords: shandite; weyl semimetal; crystal growth; magnetic properties