稀土铁硼酸盐RFe $_3$（BO $_3$）$_4$的非共振X射线磁散射
Non-Resonant X-ray Magnetic Scattering on Rare-Earth Iron Borates RFe$_3$(BO$_3$)$_4$
摘要：
硬X射线散射（HXS）实验与光子能量为100 keV的RFe $_3$（BO $_3$）$_4$家族的选定化合物作为温度和施加的磁场的函数进行。结果表明存在几个意想不到的衍射特征，特别是在磁有序相的非共振磁反射，和结构反射，违反了衍射条件的稀土铁硼酸盐的低温相$P3_121$。磁超晶格反射的温度和磁场依赖性证实了由中子衍射得到的硼酸盐化合物的磁结构。磁反射的强度和散射截面的详细分析揭示了这些材料的磁结构的细节，例如NdFe $_3$（BO $_3$）$_4$和GdFe $_3$（BO $_3$）$_4$的自旋畴结构。此外，我们还发现所有化合物的磁畴的相关长度都在100 μ m左右，并且在GdFe $_3$（BO $_3$）$_4$中，Fe磁矩从六方基面旋转出$53^\circ\pm3^\circ$
英文摘要：
Hard x-ray scattering (HXS) experiments with a photon energy of 100keV were performed as a function of temperature and applied magnetic field on selected compounds of the RFe$_3$(BO$_3$)$_4$ family. The results show the presence of several unexpected diffraction features, in particular non-resonant magnetic reflections in the magnetically ordered phase, and structural reflections that violate the diffraction conditions for the low temperature phase $P3_121$ of the rare-earth iron borates. The temperature and field dependence of the magnetic superlattice reflections corroborate the magnetic structures of the borate compounds obtained by neutron diffraction. The detailed analysis of the intensity and scattering cross section of the magnetic reflection reveals details of the magnetic structure of these materials such as the spin domain structure of NdFe$_3$(BO$_3$)$_4$ and GdFe$_3$(BO$_3$)$_4$. Furthermore we find that the correlation length of the magnetic domains is around 100 Å for all the compounds and that the Fe moments are rotated $53^\circ\pm3^\circ$ off from the hexagonal basal plane in GdFe$_3$(BO$_3$)$_4$
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