Spin density in Gd studied by magnetic Compton scattering

The spin-dependent momentum density of single-crystal ferromagnetic gadolin ium was probed by the magnetic Compton profile technique. Comparison with e lectronic structure calculations indicate that the local spin-density appro ximation is adequate for describing the magnetic Compton profiles. Furtherm ore, the linear combination of muffin-tin orbitals prescription compared fa vourably with a full-potential method. We find that testing theory against the experimental density of states is problematic. Our calculations also in dicate that the spin density is sensitive to the treatment of the 5p electr ons.