Abstract
Powder neutron diffraction studies in the temperature range from 2 K to 450 K of the ferrimagnetic ErCo3 compound (TC=401 K) revealed an increase of the unit-cell volume at 100 K (Tm) when cooling down (ΔV/V≈4×10-3). This is referred to as a temperature-induced change in the Co sublattice magnetization from a low-magnetic state (T>Tm) to a high-magnetic state (T<Tm). From the temperature variation of the sublattice magnetization (ErI (3a sites), ErII (6c), CoI (3b), CoII (6c) and CoIII (18h)) it was found that the Co moments at the 6c and 18h sites change near 100 K, giving rise to the volume anomaly at Tm. A qualitative discussion of the mechanism behind this phenomenon is given.
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