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Real-space imaging of the Verwey transition at the (100) surface of magnetite

机译:磁铁矿(100)表面Verwey跃迁的真实空间成像

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Effects of the Verwey transition on the (100) surface of magnetite were studied using scanning tunneling microscopy and spin polarized low-energy electron microscopy. On cooling through the transition temperature Tv, the initially flat surface undergoes a rooflike distortion with a periodicity of~0.5 μm due to ferroelastic twinning within monoclinic domains of the low-temperature monoclinic structure. The monoclinic c axis orients in the surface plane, along the [001]-c directions. At the atomic scale, the charge-ordered (2~(1/2) × 2~(1/2))R45° reconstruction of the (100) surface is unperturbed by the bulk transition, and is continuous over the twin boundaries. Time resolved low-energy electron microscopy movies reveal the structural transition to be first order at the surface, indicating that the bulk transition is not an extension of the Verwey-like (2~(1/2) × 2~(1/2))R45° reconstruction. Although conceptually similar, the charge-ordered phases of the (100) surface and sub-Tv bulk of magnetite are unrelated phenomena.
机译:使用扫描隧道显微镜和自旋极化低能电子显微镜研究了Verwey跃迁对磁铁矿(100)表面的影响。在通过转变温度Tv冷却时,由于低温单斜结构的单斜区域内的铁弹性孪晶,最初的平面经历了屋顶状变形,周期为〜0.5μm。单斜c轴沿[001] -c方向在表面平面中定向。在原子尺度上,(100)表面的电荷有序(2〜(1/2)×2〜(1/2))R45°重构不受整体跃迁的干扰,并在孪生边界上连续。时间分辨的低能电子显微镜电影揭示了表面上的结构转变为一阶,表明本体转变不是Verwey状(2〜(1/2)×2〜(1/2)的延伸) R45°重建。尽管从概念上讲相似,但(100)表面的电荷有序相与亚Tv磁铁矿是无关的现象。

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