Neutron Scattering by Magnons of an Antiferromagnet with Modulated Spin Amplitudes

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Abstract
Neutron scattering by the magnons of a spin-density-wave antiferromagnet is investigated with a one-dimensional local-moment model with long-range exchange. The magnon dispersion curves are unusual and the neutron inelastic scattering cross section exhibits peaks at a variety of neutron momentum transfers including the commensurable and incommensurable points. The general features of the calculation correlate remarkably well with recent neutron inelastic scattering data on chromium and strongly suggest a new interpretation of the data.