García J, Subías G, Proietti M G, Renevier H, Joly Y, Hodeau J L, Blasco J, Sánchez M C, Bérar J F
Instituto de Ciencia de Materiales de Aragón, Consejo Superior de Investigaciones Científicas y Universidad de Zaragoza, 50009 Zaragoza, Spain.
Phys Rev Lett. 2000 Jul 17;85(3):578-81. doi: 10.1103/PhysRevLett.85.578.
Resonant x-ray scattering was used to investigate electronic fluctuations of the octahedral iron atoms in magnetite. We measured the (002) and (006) "forbidden" x-ray diffraction reflections permitted by the anisotropy of the iron anomalous scattering factor. The energy and azimuthal angle dependencies of these reflections, and the polarization analysis, are shown and discussed. The results clearly show p and d iron empty states ordering in magnetite at room temperature. Moreover, the octahedral iron atoms are electronically equivalent in a time scale lower than 10(-16) sec. Therefore, magnetite should be considered as an itinerant magnet and not as a fluctuating mixed valence material.
共振X射线散射被用于研究磁铁矿中八面体铁原子的电子涨落。我们测量了由铁反常散射因子的各向异性所允许的（002）和（006）“禁戒”X射线衍射反射。展示并讨论了这些反射的能量和方位角依赖性以及偏振分析。结果清楚地表明，在室温下磁铁矿中p态和d态铁空态有序排列。此外，在时间尺度低于10^(-16) 秒时，八面体铁原子在电子方面是等效的。因此，磁铁矿应被视为一种巡游磁体，而不是一种波动的混合价材料。
