Magnetic order in natural brochantite
We propose to investigate magnetic order in natural mineral brochantite, chemical formula Cu4SO4(OH)6, by means of single crystal neutron diffraction. Brochantite belongs to S=1/2 geometrically frustrated two-dimensional (2D) Heisenberg quantum kagome antiferromagnets. Previous measurements on a synthetic polycrystalline sample showed that it orders below 7 K with a canted AFM structure as a result of competition of FM and AFM exchange interactions between strongly reduced Cu-moments. Our bulk characterization of the single crystal points to short-range low-dimensional antiferromagnetic behavior at higher temperatures with the consequent long-range magnetic order at low temperatures, as well as metamagnetic behavior in high-fields. We propose a single crystal diffraction experiment to determine the magnetic ground state of this spin-1/2 quantum system.
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PROKHNENKO Oleksandr; Alsu Gazizulina; NIKITIN Stanislav; OULADDIAF Bachir; PODLESNYAK Andrey and RODRIGUEZ VELAMAZAN Jose Alberto. (2020). Magnetic order in natural brochantite. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1097
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