Neutron Diffraction Study of ErFe2
Cubic Laves phase compounds (MgCu2-structure) involving rare earths have received considerable attention recently. We have undertaken neutron diffraction measurements on powder ErFe2 between 4.2 and 680ºK. The temperature dependence of the sublattice magnetization has been determined from the temperature dependence of the individual magnetic reflections, which are sensitive to either Er, Fe, or (Er+Fe) and (Er−Fe). The magnetic properties of ErFe2 will be discussed in terms of three molecular field parameters. It is concluded that the Er-Er interaction decreases rapidly with increasing temperature and that the Er-Fe interaction strongly affects the values of the erbium sublattice moment between 350 and 600ºK. The Fe-Fe interaction seems to dominate and tends to mask the Er-Fe and the Er-Er effects.
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