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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe_(1-x)Co_x)_2As_2 above the spin density wave transition
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Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe_(1-x)Co_x)_2As_2 above the spin density wave transition

机译：自旋密度波跃迁以上的解缠Ba（Fe_（1-x）Co_x）_2As_2的对称破坏轨道各向异性

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摘要

Nematicity, defined as broken rotational symmetry, has recently been observed in competing phases proximate to the superconducting phase in the cuprate high-temperature superconductors. Similarly, the new iron-based high-temperature superconductors exhibit a tetragonal-to-orthorhombic structural transition (i.e., a broken C_4 symmetry) that either precedes or is coincident with a collinear spin density wave (SDW) transition in undoped parent compounds, and superconductivity arises when both transitions are suppressed via doping. Evidence for strong in-plane anisotropy in the SDW state in this family of compounds has been reported by neutron scattering, scanning tunneling microscopy, and transport measurements. Here, we present an angle-resolved photoe-mission spectroscopy study of detwinned single crystals of a representative family of electron-doped iron-arsenide superconductors, Ba(Fe_(1-x)Co_x)_2As_2 in the underdoped region. The crystals were detwinned via application of in-plane uniaxial stress, enabling measurements of single domain electronic structure in the orthorhombic state. At low temperatures, our results clearly demonstrate an in-plane electronic anisotropy characterized by a large energy splitting of two orthogonal bands with dominant d_(xz) and d_(yz) character, which is consistent with anisotropy observed by other probes. For compositions x > 0, for which the structural transition (T_S) precedes the magnetic transition (T_(SDW)), an aniso-tropic splitting is observed to develop above T_(SDW), indicating that it is specifically associated with T_S. For unstressed crystals, the band splitting is observed close to T_S, whereas for stressed crystals, the splitting is observed to considerably higher temperatures, revealing the presence of a surprisingly large in-plane nematic susceptibility in the electronic structure.
机译：最近，在铜酸盐高温超导体中，在接近超导相的竞争相中观察到了定义为破坏的旋转对称性的向列。类似地，新的铁基高温超导体在未掺杂母体化合物中表现出四边形到正交的结构转变（即破碎的C_4对称性），该转变先于或同时发生共线自旋密度波（SDW）转变，并且当通过掺杂抑制两个跃迁时，就会出现超导电性。通过中子散射，扫描隧道显微镜和传输测量，已经报道了该化合物家族在SDW状态下存在强烈的平面各向异性的证据。在这里，我们提出了一个角度分辨光电子发射光谱研究，研究了掺杂不足的区域中代表性的电子掺杂的铁-砷化铁超导体Ba（Fe_（1-x）Co_x）_2As_2家族的解缠单晶。晶体通过施加面内单轴应力进行缠绕，从而可以测量正交晶态下的单畴电子结构。在低温下，我们的结果清楚地表明了一个平面内电子各向异性，其特征是两个正交带的大能量分裂具有主要d_（xz）和d_（yz）特征，这与其他探针观察到的各向异性一致。对于x> 0的成分，其结构转变（T_S）在磁性转变（T_（SDW））之前，观察到各向异性分裂在T_（SDW）之上发展，这表明它与T_S特别相关。对于未受应力的晶体，观察到能带分裂接近T_S，而对于受应力的晶体，观察到能在相当高的温度下分裂，这表明电子结构中存在出乎意料的大的面内向列磁化率。

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    Ming Yi; Donghui Lu; Jiun-Haw Chu; James G. Analytis; Adam P. Sorini; Alexander F. Kemper; Brian Moritz; Sung-Kwan Mo; Rob G. Moore; Makoto Hashimoto; Wei-Sheng Lee; Zahid Hussain; Thomas P. Devereaux; Ian R. Fisher; Zhi-Xun Shen;

  • 作者单位

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305;

    Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305,Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305;

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025,Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305;

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