Paramagnetic neutron scattering has been observed from an alloy of 65% Fe-35% Ni at temperatures up to about twice the Curie temperature and for energy transfers up to about 0.1 eV. The apparent iron atom moment is 1.4 ± 0.3 μ B and is not sharply temperature dependent whilst the moment in the ferromagnetic state is 2.3 ± 0.25 μ B . The existence of so much paramagnetic scattering at such small energy transfers indicates that atomic moments in the paramagnetic phase are defined for a relatively long period of time. This is presumably due to correlation effects between electrons.
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M. F. Collins (1965) studied this question.
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