Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 26: Correlated Magnetism – Frustrated Systems
TT 26.10: Talk
Tuesday, March 10, 2026, 12:00–12:15, HSZ/0103
Synthesis and characterization of Mn3Al 2Si 3O 12 single crystal — •Marwa Abouelela1,2, ATM Nazmul Islam2, Ralf Feyerherm2, and Bella Lake1,2 — 1Institut für Festkörperphysik, Technische Universität, Berlin, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany
Geometric magnetic frustration, typically found in materials with triangular and tetrahedral motifs, has attracted significant interest in recent research [1]. The garnet Mn3Al 2Si3O 12 exhibits geometrical frustration, where magnetic
Mn2+ (3d5) ions that have spin-5/2 form hyper-Kagome structure which is three-dimensional network of corner-sharing triangles [2]. In this study, we synthesized the first single crystals of Mn3Al 2Si3O 12 grown by the optical floating-zone technique. X-ray and neutron diffraction confirmed the garnet space group Ia3d. Temperature-dependent magnetic susceptibility measurements reveal antiferromagnetic ordering of the Mn2+ ions below TN = 6.5 K, along with an effective moment of 5.85 µβ and a Curie–Weiss temperature of TCW = −24.48 K, giving a frustration index of f = |θCW/TN| = 3.8. Investigation of the magnetic structure below TN and the short-range order above TN is ongoing.
[1] Islam, Manisha et al., Crystals 13 (2023)397
[2] Lau et al., Phys. Rev. B 80 (2009) 214414
Keywords: Frustrated magnets; Low temperature; Garnets