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Charge ordering in stoichiometric FeTe: Scanning tunneling microscopy and spectroscopy

机译:化学计量的FeTe中的电荷排序:扫描隧道显微镜和光谱学

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摘要

We use scanning tunneling microscopy and spectroscopy to reveal a unique stripy charge order in a parent phase of iron-based superconductors in stoichiometric FeTe epitaxy films. The charge order has unusually the same-usually half-period as the spin order. We also found highly anisotropic electron band dispersions being large and little along the ferromagnetic (crystallographic b) and antiferromagnetic (a) directions, respectively. Our data suggest that the microscopic mechanism is likely of the Stoner type driven by interatomic Coulomb repulsion V_(ij), and that V_(ij) and charge fluctuations, so far much neglected, are important to the understanding of iron-based superconductors.
机译:我们使用扫描隧道显微镜和光谱学来揭示化学计量的FeTe外延膜中铁基超导体的母相中独特的带状电荷顺序。充电顺序通常与旋转顺序相同,通常为一半。我们还发现高度各向异性的电子带色散分别沿着铁磁(晶体学b)和反铁磁(a)方向大而小。我们的数据表明,微观机理很可能是原子间库仑斥力V_(ij)驱动的斯托纳型,而迄今为止被忽略的V_(ij)和电荷波动对理解铁基超导体很重要。

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  • 来源
    《Physical review》 |2016年第4期|041101.1-041101.5|共5页
  • 作者单位

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China,Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;

    Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China,Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China,Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China,Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China,Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China,Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;

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