Magnetic Structure of RuSr2GdCu2O8 Determined by Resonant X-Ray Diffraction

Bohnenbuck, B.; Zegkinoglou, I.; Strempfer, J.; Nelson, C. S.; Wu, H.-H.; Schüßler-Langeheine, C.; Reehuis, M.; Schierle, E.; Leininger, Ph.; Herrmannsdörfer, T.; Lang, J. C.; Srajer, G.; Lin, C. T.; Keimer, B.

Magnetic Structure of RuSr₂GdCu₂O₈ Determined by Resonant X-Ray Diffraction

Bohnenbuck, B.; Zegkinoglou, I.; Strempfer, J.; Nelson, C. S.; Wu, H.-H.; Schüßler-Langeheine, C.; Reehuis, M.; Schierle, E.; Leininger, P.; Herrmannsdörfer, T.; Lang, J. C.; Srajer, G.; Lin, C. T.; Keimer, B.

X-ray diffraction with photon energies near the Ru L2-absorption edge was used to detect resonant
reflections characteristic of a G-type superstructure in RuSr2GdCu2O8 single crystals. A polarization
analysis confirms that these reflections are due to magnetic order of Ru moments, and the azimuthal-angle
dependence of the scattering amplitude reveals that the moments lie along a low-symmetry axis with
substantial components parallel and perpendicular to the RuO2 layers. Complemented by susceptibility
data and a symmetry analysis of the magnetic structure, these results reconcile many of the apparently
contradictory findings reported in the literature

Physical Review Letters 102(2009), 037205

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