Magnetic structure of RuSr$_2$GdCu$_2$O$_8$ determined by resonant x-ray diffraction

Details Magnetic structure of RuSr$_2$GdCu$_2$O$_8$ determined by resonant x-ray diffraction Magnetic structure of RuSr$_2$GdCu$_2$O$_8$ determined by resonant x-ray diffraction

2008-12-16

arxiv.org/abs/0812.3024v1

Phys. Rev. Lett. 102, 037205 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

to appear in PRL

Scientific paper

10.1103/PhysRevLett.102.037205

X-ray diffraction with photon energies near the Ru L$_2$-absorption edge was used to detect resonant reflections characteristic of a G-type superstructure in RuSr$_2$GdCu$_2$O$_8$ 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 RuO$_2$ 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.

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