Electrical Resistivity of Europium and Ytterbium

Electrical resistivity measurements on europium and ytterbium metals from 1.3^∘{} to 300^∘{}K are reported. Europium exhibits a sharp peak in its resistivity at 90^∘{}K which must correspond to its magnetic ordering temperature. The shape of the peak indicates antiferromagnetic ordering below 90^∘{}K. Ytterbium has no sharp anomalies in its resistivity.