The magnetic structure factor of an equiatomic ordered FeCo compound has been determined by measuring the coherent scattering of a polarized neutron beam from a single-crystal sample. Fourier inversion of the experimental data has allowed us to derive the magnetic moments and the spin-density symmetry at the Fe and Co sites. Considering that both 3d up-spin bands are entirely full it has also been possible to derive the symmetry and the distribution of the charge density. A comparison with available state-of-the-art theoretical calculations has evidenced significant and systematic inadequacies of the local-spin-density approximation.
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Fabrizio et al. (1989) studied this question.
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