A central mode in the ferromagnetic phase transition of Pr 3 Tl is observed by inelastic and quasielastic neutron scattering. The integrated intensity has a Lorentzian wavevector dependence with a correlation range that is much larger than in ordinary ferromagnets. The softening of the exciton mode is considerably smaller than predicted by mean field theory.
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Als‐Nielsen et al. (1977) studied this question.
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