Paramagnetic scattering from Fe(3.5 at. % Si): Neutron measurements up to the zone boundary

Paramagnetic scattering cross sections of Fe(3.5 at. % Si) are measured at T=1.1$T_c$ and 1.25$T_c$ over the entire Brillouin zone. The major part of these magnetic cross sections is confined below 60 meV even near the zone boundary, in agreement with the recent report by Brown et al. The energy-integrated value of the magnetic moment at the zone boundary is (2.7±1.0)${\mu }_B^2$. This value is smaller than what would be expected for localized systems and gives experimental support for the itinerant-electron character of ferromagnetism in Fe.