Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.42: Poster
Thursday, September 8, 2022, 16:00–18:00, P4
Frustrated triangular magnetism in new copper based single crystals. — •Aswathi Mannathanath Chakkingal1, Chloe Fuller2, Dmitry Chernyshov2, Maxim Avdeev3, Marein Christopher Rahn1, Falk Pabst4, Yiran Wang4, Darren Peets1, and Dmytro Inosov1 — 1IFMP, TU Dresden, Germany — 2ESRF, Grenoble, France — 3ANSTO, Sydney, Australia — 4Professur f. Anorganische Chemie II, TU Dresden, Germany
The hydrothermal technique is an efficient strategy to synthesize mineralogically inspired structures, including natural and synthetic cuprate minerals with a variety of exciting frustrated magnetic lattices. We report the hydrothermal synthesis of single crystals of a new material Cu4(SO4)(OH)6. Single-crystal x-ray and neutron diffraction studies performed to determine the crystal structure reveal the presence of three copper layers which stack in an ABACABAC pattern in the crystal, which results in a large b lattice constant of 25Å. Seemingly-distorted and -expanded SO42− tetrahedra in the system are likely attributable to vacancies and structural disorder. The Cu2+ copper ions are arranged in buckled sheets consisting of ribbons of edge-sharing and corner-sharing octahedra, and form a heavily distorted triangular lattice. Diffuse scattering measured with synchrotron x-rays also reveals strong stacking-fault disorder in this system. We report details of the crystal structure and its low temperature magnetic properties.