Abstract
Inelastic polarised neutron scattering is analysed when the magnetic interaction includes a part characterised by an axial vector. In this case the dynamical chiral (DC) scattering and inelastic nuclear-magnetic interference (INMI) may appear. As examples we consider magnetic field and antiferromagnets with k AF =0 . Possibilities of other axial-vector interactions such as the Dzialoshinskii–Moriya interaction and elastic torsion are mentioned too. The DC scattering in magnetic field is determined by the three-spin correlations. Their experimental investigation in iron above T c allows to confirm predictions of the Polyakov–Kadanoff–Wilson operator algebra and demonstrate crossover to the dipolar critical dynamics. The INMI in the antiferromagnets with k AF =0 is considered theoretically and appearance of the infra-red divergence in the case of quasi-2D compound BaNi 2(PO 4) 2 was demonstrated.
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