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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.16: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P4

Geometric Magnetic Frustration in Mn₃Al₂Si₃O₁₂ — •Marwa Abouelela^1,2, Nazmul Isalam², Ralf Feyerherm², and Bella Lake^1,2 — ¹Institut für Festkörperphysik, Technische Universität, Berlin, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany

Geometric magnetic frustration in triangular lattices has garnered significant interest in recent research [1]. Mn₃Al₂Si₃O₁₂ exhibits geometrical frustration, where Mn²⁺ (3d⁵) ions form a hyperkagomé structure [2]. In this study, the spessartine was synthesized at high temperatures, and its magnetic susceptibilities and heat capacities were investigated at low temperatures. Temperature-dependent magnetic susceptibility measurements revealed an antiferromagnetic ordering of the Mn²⁺ ions below T_N=6.5K, with a Curie-Weiss temperature of -26.7K. The high ratio of Curie-Weiss temperature to Néel temperature suggests strong frustration in the system.

[1] A. P. Ramirez, Annu. Rev. Mater. Sci. 24, 453 (1994);

[2] G. C. Lau et al., Phys. Rev. B 80, 214414 (2009).

Keywords: Frustrated magnets