Influence of crystals fields on the magnetic form factor of samarium

It is calculated that crstal fields, with inclusion of mixing of higher multiplets into the ground $\text{J =}\text{5}\text{2}$ state, have a substantial effect on the magnetic form factor of Sm³⁺. From the neutron diffraction data obtained by Koehler and Moon for the cubic site in Sm metal it follows that the quartet Γ₈ is lowest, with the sixth-order crystalline field parameter A₆〈ritr⁶〉 positive. The conduction electron moment residing on Sm is estimated to be of the order of 0.4 μ_B.