Polarized neutron scattering study of the spin chirality

To study the average value of the chirality in helically polarized antiferr omagnets below T-N, the interaction of the chirality with elastic torsion h as been exploited for a preferable population of one kind of chiral domains in Ho. For the investigation of chiral fluctuations above T-N a dynamical chirality (DC) which is the projection of the chiral held on the induced sa mple magnetization has been studied with polarized neutrons. For the first time the completely inelastic spin-dependent cross-section has been observe d in CsMnBr3 and shown to be an odd function of the energy transfer as theo retically predicted. Spin-dependent chiral scattering has also been found f or the spin waves in the magnetically ordered region of CsMnBr3. (C) 1999 P ublished by Elsevier Science B.V. All rights reserved.