The physical origins of anomalous volume effect (Invar effect) and elastic effect (Elinvar effect) arc critically examined. We found that, unlike the volume effect, the shear elastic properties are not much influenced by the ferromagnetic transition. ...
The physical origins of anomalous volume effect (Invar effect) and elastic effect (Elinvar effect) arc critically examined. We found that, unlike the volume effect, the shear elastic properties are not much influenced by the ferromagnetic transition. This finding shows that the two anomalies originate from different physical origins, thus contradicting the conventional wisdom. We discuss the consequences of this finding in the light or recent experiments.