Abstract
High-resolution polarized and unpolarized neutron scattering experiments have been performed in order to characterize the paramagnetic scattering from the ..gamma..-phase (fcc) of metallic iron. Assuming that the width GAMMA of the energy distribution of the paramagnetic scattering varies like q/sup delta/, the experimental results are consistent with values of delta between 1 and 1.5. Therefore, for ..gamma..-Fe, the q dependence of GAMMA does not follow the behavior predicted for a ferromagnet (delta> or =2) by dynamical scaling. On the other hand, the results demonstrate that the spin-spin correlations in ..gamma..-Fe are ferromagnetic in nature, characterized by an inverse correlation length between approximately 0.25 and 1 A/sup -1/. This result is consistent with the conclusions reached in recent neutron scattering experiments which were performed on ..gamma..-Fe at higher momentum transfers.
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