The neutron scattering cross section below the Neel temperature in RbMnF 3 has been studied with the aid of neutron spin polarisation analysis. In addition to the spin-wave scattering, a small central component was observed and found to be longitudinal in character. This longitudinal scattering is quasi-elastic, with an intensity that decreases with increasing wavevector and with decreasing temperature below T N .
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Cox et al. (1989) studied this question.
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