Magnetite, a model system for mixed-valence oxides, does not show charge ordering.
Magnetite, a model system for mixed-valence oxides, does not show charge ordering.
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磁铁矿是混合价氧化物的模型系统，不显示电荷排序。
DOI：
10.1103/physrevlett.93.156408
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发表时间：
2004
影响因子：
8.6
通讯作者：
M. Concepción Sánchez
中科院分区：
文献类型：
--
作者：
G. Subías;Joaquín J. García;J. Blasco;M. Grazia Proietti;H. Renevier;M. Concepción Sánchez
我们研究了低于 Verwey 转变的磁铁矿中的电荷排序 (CO)。通过 X 射线共振散射研究了一组新的低温相半整数和混合整数超晶格反射。这些反射都没有显示出 CO 的特征。我们证明了沿 c 轴不存在 CO，其周期性为立方晶格 q=(001) 或双立方晶格 q=(001/2)。这一结果表明，Verwey 跃迁是由强电子-声子相互作用引起的，而不是八面体 Fe 原子上的电子排序引起的。
We have investigated the charge ordering (CO) in magnetite below the Verwey transition. A new set of half-integer and mixed-integer superlattice reflections of the low-temperature phase have been studied by x-ray resonant scattering. None of these reflections show features characteristic of CO. We demonstrate the absence of CO along the c axis with the periodicity of either the cubic lattice q=(001) or the doubled cubic lattice q=(001/2). This result suggests that the Verwey transition is caused by strong electron-phonon interaction instead of an electronic ordering on the octahedral Fe atoms.