Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Frustrated Magnets I

MA 21.11: Talk

Wednesday, March 19, 2025, 12:15–12:30, H18

Short-range spin correlations in the 3D face-centred frustrated spin-5/2 system MnSn(OH)6 — •Kaushick K. Parui¹, Anton A. Kulbakov¹, Ellen Häußler², Nikolai S. Pavlovskii¹, Roman Gumeniuk³, Thomas Doert², Maxim Avdeev⁴, Dmytro S. Inosov¹, and Darren C. Peets¹ — ¹IFMP, TU Dresden, Germany — ²AC II, TU Dresden, Germany — ³IEP, TU Bergakademie Freiberg, Germany — ⁴ANSTO, Australia

Manganese tin hydroxide, MnSn(OH)₆, is an A-site-vacant double perovskite with magnetic Mn²⁺ ions on a face-centred sublattice, creating frustration that may lead to exotic magnetism. Combined x-ray and neutron diffraction data analysis reveals tetragonal P4₂/n symmetry with precise H/D positions. Despite dominant antiferromagnetic interactions among Mn²⁺ moments, evidenced by a negative Curie-Weiss temperature, the lack of a sharp thermodynamic transition down to 350 mK implies the absence of long-range magnetic order. This suppression of the magnetic order hints towards a large frustration factor >10. Low-temperature neutron diffraction performed at 20 mK shows the absence of sharp magnetic Bragg peaks but reveals broad diffuse peaks, indicating 3D antiferromagnetic short-range interactions with a correlation length of roughly three unit cells.

Keywords: Frustrated Magnetism; Neutron diffraction; Specific heat; Antiferromagnetism; Hydroxide Perovskite