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MA: Fachverband Magnetismus
MA 27: Frustrated Magnets I
MA 27.6: Vortrag
Mittwoch, 20. März 2024, 16:15–16:30, H 2013
Frustrated triangular magnetism in new copper based single crystals — •Aswathi Mannathanath Chakkingal1, Chloe Fuller Fuller2, Dmitry Chernyshov2, Maxim Avdeev3, Marein Christopher Rahn1, Yiran Wang4, Falk Pabst4, Thomas Doert4, 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. Distorted and expanded SO42− tetrahedra are identified in the system, likely due to vacancies. 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.
Keywords: copper based; frustrated magnet; triangular lattice; crystal structure; distorted lattice