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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.22: Poster

Donnerstag, 30. März 2023, 14:00–16:00, P2/EG

Crystal structural investigations of frustrated 3D spin-1/2 system CuSn(OH)6 — •Kaushick Parui¹, Anton Kulbakov¹, Ellen Häußler², Thomas Doert², Vladimir Pomjakushin³, Dmytro Inosov¹, and Darren Peets¹ — ¹IFMP, TU Dresden, Germany — ²Professur f. Anorganische Chemie II, TU Dresden, Germany — ³LNS, Paul Scherrer Institut, Switzerland

Copper tin hydroxide, CuSn(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 Cu²⁺ ions sit on a face-centred sublattice, which makes the system frustrated and is expected to exhibit exotic quantum magnetism. Room-temperature x-ray diffraction performed on polycrystalline samples reveals tetragonal P4₂/n symmetry, possibly with a minor monoclinic distortion. The structure is characterized by the presence of alternating corner-sharing [Cu²⁺(OH)₆] and [Sn⁴⁺(OH)₆] at 4d and 4c sites, respectively. Low-temperature neutron diffraction performed on deuterated powder samples accurately determined hydrogen positions. The positions of other atoms differ significantly from the previously published structure. Our proposed crystal structure of CuSn(OH)₆ is consistent with the tilt system a⁺a⁺c⁻, as compared to the earlier proposed a⁰b⁺b⁺. Magnetization measurements reveal a weak anomaly at 4.1 K suggesting a possible magnetic transition. Surprisingly, magnetic neutron diffraction revealed no long-range order down to 1.6 K. The Curie-Weiss temperature of −7.1(3) K, indicating antiferromagnetic interactions, and a paramagnetic moment of ≈ 2.2 µ B were also determined.