Abstract
The differential cross-section of inelastic scattering of slow neutrons by MnF 2 was measured close to the Néel temperature, using a “time of flight” method. The angular distribution and the energy spectrum of the scattered neutrons were observed for different values of the angle of rotation of the crystal, aligned in the neighbourhood of the Bragg magnetic peak position (100). At ( T− T N ) = 0.92°K, a value of 17 Å was found for the spatial correlation parameter 1 K 1 of the critical fluctuations of magnetization; this is in good agreement with theoretical prediction, and the results of previous experiments. However, the information derived from the energy spectra does not appear to confirm the theory of spin relaxation in an antiferromagnetic body. The limits of applicability of this theory are discussed, and this leads to an expression for the differential cross-section, taking into account the experimental resolution. This expression is compared with the results of the experiment.
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