Abstract
Polarized neutron measurements of the magnetic form factor of Eu 2+ in EuO were made, to check for possible solid state effects on the radial extent of the 4f wavefunctions in this ferromagnetic insulator. Previous studies show good agreement between the magnetic form factors observed for the heavy rare earth metals and those calculated for the free ions using relativistic Dirac-Fock wavefunctions. However, the same comparison in this case shows an approximate 9% expansion of the 4f wavefunctions in EuO relative to that calculated for the Eu 2+ ion. This apparent solid state effect has the same sign but twice the magnitude of that recently calculated by Byrom, Ellis and Freeman for (EuO 6) −12 clusters.
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