Short-Range Correlations in Magnetite above the Verwey Temperature
Short-Range Correlations in Magnetite above the Verwey Temperature
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DOI：
10.1103/physrevx.4.011040
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发表时间：
2014-03-17
影响因子：
12.5
通讯作者：
Parlinski, Krzysztof
中科院分区：
文献类型：
--
作者：
Bosak, Alexey;Chernyshov, Dmitry;Parlinski, Krzysztof
磁铁矿（Fe3O4）是古希腊人类第一个发现并利用的磁性材料，但由于其令人费解的特性仍然引起人们的关注。这主要是因为我们需要对 T-V = 124 K 时发生的 Verwey 转变有一个完整、连贯的理解，该转变与电导率下降和复杂的结构相变有关。最近基于单晶衍射对该结构的详细分析表明，电子定位图案包含线性三铁单元，即所谓的三聚体。在这里，我们表明，无论电子局域模式是什么，它在高温立方相中作为短程相关性部分地存在于室温下，很容易通过漫散射来辨别。此外，从头开始的电子结构计算表明，这些漫散射图案中的特征可以与费米表面拓扑相关。
Magnetite, Fe3O4, is the first magnetic material discovered and utilized by mankind in Ancient Greece, yet it still attracts attention due to its puzzling properties. This is largely due to the quest for a full and coherent understanding of the Verwey transition that occurs at T-V = 124 K and is associated with a drop of electric conductivity and a complex structural phase transition. A recent detailed analysis of the structure, based on single crystal diffraction, suggests that the electron localization pattern contains linear three-Fesite units, the so-called trimerons. Here, we show that whatever the electron localization pattern is, it partially survives up to room temperature as short-range correlations in the high-temperature cubic phase, easily discernible by diffuse scattering. Additionally, ab initio electronic structure calculations reveal that characteristic features in these diffuse scattering patterns can be correlated with the Fermi surface topology.