Theory of compositional and magnetic correlations in alloys: Interpretation of a diffuse neutron-scattering experiment on an iron-vanadium single crystal

We describe a first-principles theory for compositional and magnetic correlations in alloys and compare the results of the theory with recent diffuse, unpolarized, neutron-scattering measurements on a single crystal of ferromagnetic ${\mathrm{Fe}}_{0.865}$ ${\mathrm{V}}_{0.135}$. The nuclear cross section is described very well by the theory and we are able to connect the q-dependent structure to the underlying electronic structure of the alloy. The magnetocompositional and magnetic correlations also may be obtained for comparison to polarized measurements.