Abstract
This paper focuses on the phenomenon of the ‘‘exchange amplification’’ of inelastic neutron scattering as compared to the elastic one around some Bragg peaks on small transferred momenta and energies. The effect is closely connected with increasing of the amplitude of uniform vibrations of some spin linear combinations. Since all the above-mentioned magnetics are multisublattice quasi-two-dimensional, those with an anomalously large intralayer exchange as compared to the interlayer one has the exchange amplification effect for the exchange and acoustic modes for all wave vectors directed perpendicularly to layers right up to the Brillouin zone edge. The same effect takes place in the region of the dispersion law being linear for small (compared with the intralayer exchange) transferred energies. The greater intensity of inelastic magnetic scattering as compared with the elastic one was observed in some experiments. The selection laws defining Bragg peaks around which the inelastic scattering is exchange amplified have been obtained. The peculiarities of the inelastic neutron scattering in Nd2CuO4 for the different magnetic structures—collinear and noncollinear—are considered.
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