Spin density of ordered FeCo: A failure of the local-spin-density approximation
- 15 November 1989
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 40 (14) , 9502-9507
- https://doi.org/10.1103/physrevb.40.9502
Abstract
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.Keywords
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