Full polarization analysis of resonant superlattice and forbidden x-ray reflections in magnetite.
Full polarization analysis of resonant superlattice and forbidden x-ray reflections in magnetite.
复制标题
共振超晶格的全偏振分析和磁铁矿中禁止的 X 射线反射。
DOI：
10.1088/0953-8984/21/48/485601
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Bland SR
中科院分区：
文献类型：
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作者：
Bland SR
尽管磁铁矿是已知最古老的磁性材料之一，也是被认为是电荷有序的经典混合价化合物，但在Verwey转变以下的磁铁矿结构是复杂的，电荷有序的存在和作用仍然存在争议。在这里，我们提出了在铁的K-边缘上禁止（0，0，2n+ 1）C和超晶格反射的共振X射线衍射数据。对入射光和散射光进行了全线性偏振分析，以探索反射的起源。通过模拟的共振光谱，我们已经证实，一定程度的电荷有序发生，而各向异性张量的磁化率散射是负责的Verwey过渡以下的超晶格反射。我们还报告了令人惊讶的结果的转换的显着比例的散射光从线性到非线性偏振。
Despite being one of the oldest known magnetic materials, and the classic mixed valence compound, thought to be charge ordered, the structure of magnetite below the Verwey transition is complex and the presence and role of charge order is still being debated. Here, we present resonant x-ray diffraction data at the iron K-edge on forbidden (0, 0, 2n+ 1) C and superlattice reflections. Full linear polarization analysis of the incident and scattered light was conducted in order to explore the origins of the reflections. Through simulation of the resonant spectra we have confirmed that a degree of charge ordering takes place, while the anisotropic tensor of susceptibility scattering is responsible for the superlattice reflections below the Verwey transition. We also report the surprising result of the conversion of a significant proportion of the scattered light from linear to nonlinear polarization.