Magnetic incoherent elastic scattering from an antiferromagnetic CrFe alloy

The incoherent elastic neutron scattering cross sections of an antiferromagnetic Cr 2.8 at% Fe alloy has been measured. The results indicate that there is no magnetic incoherent component over the range of wave vector transfers studied, i.e. as close as 0.11 A-1 to the (100) magnetic reciprocal lattice point. From previous coherent scattering experiments the perturbation of the antiferromagnetic moment of chromium by added iron impurities is known to be large. It is concluded from these two facts that the magnetic perturbation of chromium by iron is very long-ranged in real space, so that a good physical picture is that all the chromium moments are affected equally by the addition of iron impurities. (author)