A novel low temperature rearrangement of atoms in the rare earth intermetallic compound ErFe3

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Abstract
The Mossbauer effect in 57Fe has been used to locate and identify a novel low temperature rearrangement of atoms in the rare earth intermetallic compound ErFe3. It is argued that the iron atoms at both the c and h crystallographic sites suddenly shift their positions as the temperature is lowered through 47+or-1K. However, the movements of these iron atoms do not give rise to a change in the space group R3m of the crystal. Some suggestions are made concerning the driving force behind the transition.