High-field spin-flop state in green dioptase
arXiv:2101.08555 · doi:10.1103/PhysRevB.103.014427
Abstract
The high-field magnetic properties and magnetic order of the gem mineral green dioptase CuSiOHO have been studied by means of single-crystal neutron diffraction in magnetic fields up to T and magnetization measurements up to T. In zero field, the Cu-moments in the antiferromagnetic chains are oriented along the -axis with a small off-axis tilt. For a field applied parallel to the -axis, the magnetization shows a spin-flop-like transition at T at K. Neutron diffraction experiments show a smooth behavior in the intensities of the magnetic reflections without any change in the periodicity of the magnetic structure. Bulk and microscopic observations are well described by a model of ferromagnetically coupled antiferromagnetic spin- chains, taking into account a change of the local easy-axis direction. We demonstrate that the magnetic structure evolves smoothly from a deformed Néel state at low fields to a deformed spin-flop state in a high field via a strong crossover around . The results are generalized for different values of interchain coupling and spin anisotropy.
12 pages, 12 figures
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