Abstract
We study the influence of the non-diagnonal terms in an easy-plane Heisenberg ferromagnet on the cross-section for inelastic neutron scattering from single spin-wave states. We show that these terms modify the wavevector dependence of the cross-section for unpolarized neutrons, and the created polarization. An appropriate experiment on CsNiF3, for example, should be a good test of these predictions, and would eventually clarify some uncertainties about the appropriate Boson Hamiltonian for an easy-plane ferromagnet.
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Lovesey, S.W., Steiner, M. Elementary excitations in easy-plane Heisenberg ferromagnets. Z. Physik B - Condensed Matter 42, 241–244 (1981). https://doi.org/10.1007/BF01422028
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DOI: https://doi.org/10.1007/BF01422028