Abstract
We report the field-induced magnetic form factor of the heavy-electron system URu 2Si 2 obtained by using polarized neutrons. The neutron experiments were performed on the two single crystals at 60 K by applying a magnetic field of 6 T along the tetragonal c-axis. The observed magnetic form factor is close to the theoretical 5f form factor of the free U 3 + or U 4 + ions calculated by the dipole approximation as other U-based intermetallic superconductors. However, the extrapolated value at sin θ / λ = 0 ( 0.07 μ B / U ) is smaller than the bulk magnetization value ( 0.10 μ B / U ) . Therefore, this result indicates some contribution other than 5f electrons to the bulk magnetization of URu 2Si 2.
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