TEMPERATURE-DEPENDENCE OF THE FIELD-INDUCED MAGNETIC FORM-FACTOR OF CESN3

Polarized neutron scattering techniques have been used to study the spatial distribution and temperature dependence of the magnetization induced in a single crystal of CeSn3 by a magnetic field of 42.5 kG. We find that in the 300-40 K temperature range the measured form factor is in good agreement with the free ion 4f magnetic form factor of Ce3+. Below 40 K large deviations from a 4f magnetic form factor were observed. A satisfactory fit to the data below 40 K can be obtained by assuming that the induced magnetization contains a large component of 5d electronic character of eg symmetry.