Magnetostriction Due to Rare-Earth Impurities in a Metal

The magnetostriction of dilute alloys of rare-earth impurities in Y${\mathrm{Pd}}_3$ follows closely the simple $\frac{H}{T}$ dependence of the field-parallel component of a quadrupole moment on the free rare-earth ion moving with the magnetic moment. The saturated magnetostriction per impurity ion is as large as in the magnetically ordered state of rare-earth compounds but does not trace the Stevens factor across the rare-earth series.