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MA: Fachverband Magnetismus

MA 39: Poster Magnetism II

MA 39.19: Poster

Mittwoch, 11. März 2026, 18:00–21:00, P2

More is not always better: the case of Mn_0.56Ge_0.09Sb_0.23Te — Tijmen Groot¹, Marie Tardieux¹, Laura T. Corredor^2,3, Manaswini Sahoo⁴, Anja U.B. Wolter⁴, and •Anna Isaeva^1,2,3 — ¹University of Amsterdam, The Netherlands — ²TU Dortmund University, Germany — ³Research Center Future Energy Materials and Systems, Germany — ⁴Leibniz IFW Dresden, Germany

In the quest to optimize magnetic topological materials within the (MnX₂Te₄)(X₂Te₃)_n family [1], Mn enrichment appears to be a viable strategy that enhances the ferrimagnetic ground state and the Curie temperature. We recently reported the most Mn-rich phases derived from MnSb₂Te₄, achieving T_C = 58-73 K [2-3], nearly satisfying one key requirement for potential applications.

Our further attempts to tune T_C show that not only Mn richness but also lattice symmetry plays a key role. Here we present the cubic, Mn-rich compound Mn_0.56Ge_0.09Sb_0.23Te (Fm3m, a = 5.9320(2) Å), as identified by powder and single-crystal XRD, SEM/EDX, and DC susceptibility. Due to the statistical disorder of Mn, Ge, and Sb over the cationic sites, it loses ferrimagnetic order in favor of an A-type antiferromagnetic arrangement with a low T_N = 25 K. This ground state is also supported by DFT+U calculations across a wide range of plausible compositions.

References: [1] National Science Review 11 (2024), nwad282; [2] Mater. Today Phys. 38 (2023), 101265; [3] Chem. Mater. 37 (2025), 1446-1456.

Keywords: topological insulators; magnetic materials; crystal structure; inorganic synthesis; materials discovery