共振X射线衍射法测定RuSr $_2$ GdCu $_2$ O $_8$的磁性结构
Magnetic structure of RuSr$_2$GdCu$_2$O$_8$ determined by resonant x-ray diffraction
摘要：
利用X射线衍射技术，在Ru L $_2$吸收边附近的光子能量，研究了RuSr $_2$ GdCu $_2$ O $_8$单晶中G型超结构的共振反射特性。偏振分析证实，这些反射是由于磁顺序Ru矩，和方位角的散射振幅的依赖性表明，该时刻位于沿低对称轴与实质性的组件平行和垂直的RuO $_2$层。补充磁化率数据和对称性分析的磁结构，这些结果调和了许多明显矛盾的研究结果在文献中报道。
英文摘要：
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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