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.