Subías Gloria, García Joaquín, Blasco Javier, Grazia Proietti M, Renevier Hubert, Concepción Sánchez M
Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pza. San Francisco s/n 50009 Zaragoza, Spain.
Phys Rev Lett. 2004 Oct 8;93(15):156408. doi: 10.1103/PhysRevLett.93.156408. Epub 2004 Oct 7.
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.
我们研究了低于韦尔韦转变温度时磁铁矿中的电荷有序（CO）。通过X射线共振散射研究了低温相的一组新的半整数和混合整数超晶格反射。这些反射均未显示出电荷有序的特征。我们证明了沿c轴不存在周期性为立方晶格q =（001）或加倍立方晶格q =（001/2）的电荷有序。该结果表明，韦尔韦转变是由强电子-声子相互作用引起的，而不是由八面体铁原子上的电子有序引起的。
