Resonant x-ray scattering from multi-k magnetic structures
Resonant x-ray magnetic scattering gives access to magnetic Bragg reflections, which are forbidden in neutron and non-resonant x-ray diffraction. The symmetry constraints on the magnetic configuration implied by processes involving a rotation of the photon polarization, where the scattering operator projects the local magnetization onto two orthogonal axes, as opposed to the single-axis projection of conventional techniques, bring important new light to bear in the determination of magnetic structures. As an example, we have established the multi-k nature of the intrinsic magnetic configuration in Uas(0.8)Se(0.2) through the presence of peaks in the scattering pattern of the form (k(i) + k(j)) with i not equal to j. Their identification, by a distinct energy, momentum, polarization, and azimuthal dependence, yields unique information on the unperturbed magnetic structure. In the present case, working at the M4 uranium edge, the peaks have approximately 1% of the intensity of the main resonant (0 0 k(i)) magnetic satellites. The technique, free of the ambiguities introduced by application of external perturbations which hamper interpretation of such multi-k structures by conventional diffraction, may find application in rare-earth and transition-metal compounds despite the weaker enhancements of the respective L and K resonance.
Bibliographic Reference: An article published in: Physical Review B, 66, 054417 (2002)
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://link.aps.org/abstract/PRB/v66/e054417
Record Number: 200215702 / Last updated on: 2003-01-09
Original language: en
Available languages: en