Magnetic excitations of a spin tube
The rhombohedral gem-stone mineral green dioptase CuSiO3„eH2O 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. We propose to study the magnetic excitation spectrum of green dioptase, in order to establish a reliable scheme of exchange integrals. We wish to perform overview measurements on IN20 and Thales using FlatCone, completed by well-resolved single-detector scans on Thales.
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ENDERLE Mechthild and BOEHM Martin. (2018). Magnetic excitations of a spin tube. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1574
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