Magnetic structure of a spin tube
The rhombohedral gem-stone mineral green dioptase CuSiO3.H2O contains Cu2+-oxygen spirals along the hexagonal c-axis with a honeycomb arrangement of the spirals in the ab-plane. Susceptibility, specific heat, neutron diffraction, and quantum chemical calculations of the exchange paths point to a quasi-one dimensional Heisenberg antiferromagnetic chain behaviour with antiferromagnetic intrachain exchange of 74K, and ferromagnetic interchain interaction of 6K. However, susceptibility and Raman data have been interpreted as evidence for dimer formation in the ab-plane, with a dimer gap of 6meV and a two-dimer excitation of 10.5 meV. This scenario locates green dioptase close to a quantum critical point. A low ordered moment and a large spin-flop transition field of 13.5T are difficult to reconcile. We propose to reinvestigate the magnetic structure of green dioptase using single-crystal polarised neutron diffraction on D3.
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ENDERLE Mechthild; R. K. Kremer and QURESHI Navid. (2018). Magnetic structure of a spin tube. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-54-252
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