Berlin 2024 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 27: Frustrated Magnets I

MA 27.12: Vortrag

Mittwoch, 20. März 2024, 18:00–18:15, H 2013

Magnetism in the 3D face-centred frustrated spin-5/2 system MnSn(OH)6 — •Kaushick K. Parui¹, Anton A. Kulbakov¹, Roman Gumeniuk², Maxim Avdeev^3,4, Darren C. Peets¹, and Dmytro S. Inosov¹ — ¹IFMP, Technische Universität Dresden, 01069 Dresden, Germany — ²Institut für Experimentelle Physik, TU Bergakademie Freiberg, 09596 Freiberg, Germany — ³ANSTO, Lucas Heights, NSW 2234, Australia — ⁴School of Chemistry, The University of Sydney, Sydney 2006, Australia

Manganese tin hydroxide, MnSn(OH)₆ is an A-site-vacant double perovskite with the general stoichiometry ₂(BB^′)(OH)₆, where B and B^′ are transition metals. Here, the magnetic Mn²⁺ ions sit on a face-centred sublattice, which makes the system frustrated and is expected to exhibit exotic magnetism. The structure is characterized by the presence of alternating corner-linked [Mn²⁺(OH)₆] and [Sn⁴⁺(OH)₆] octahedra. Our magnetization measurements reveal the Curie-Weiss temperature of −5.13(1) K, indicating antiferromagnetic interactions, and a paramagnetic moment of ≈ 5.6 µ B. Despite that, specific heat measurements do not show any sharp magnetic transitions down to 350 mK. This suppression of the magnetic order hints towards a large frustration factor >10. We also report the results of neutron diffraction measurements down to 20 mK and structure refinements based on x-ray and neutron powder diffraction data.

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