REFINEMENT OF MAGNETIC-STRUCTURES WITH X-RAYS - ND AS A TEST-CASE

We present a magnetic structural refinement using resonant magnetic x- ray scattering to investigate the antiferromagnetic structure of singl e-crystal elemental neodymium at 10 K. By comparison with neutron-diff raction results, we show that x rays can be used for refinement of com plex magnetic structures. However, unlike neutrons, x rays distinguish between the magnetic responses of the two different Nd sites in the c rystal structure. Our fits to the observed intensities are significant ly improved by the inclusion of a scattering vector-dependent term rem iniscent of a form factor. The theoretical issues underlying our obser vations are discussed.