SKM 2023 – wissenschaftliches Programm
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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.