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Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe_(0.55)Se_(0.45)

机译:FeTe_(0.55)Se_(0.45)中电子费米表面上具有增强配对的各向同性超导间隙

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摘要

We used angle-resolved photoemission spectroscopy to reveal directly the momentum distribution of the superconducting gap in FeTe_(1-x)Se_x, which has the simplest structure of all Fe-based superconductors. We found isotropic superconducting gaps on all Fermi surfaces whose sizes can be fitted by a single gap function derived from a strong coupling approach, promoting local antiferromagnetic exchange interactions as a serious candidate for the pairing origin.
机译:我们使用角分辨光发射光谱法直接揭示了FeTe_(1-x)Se_x中超导间隙的动量分布,它是所有Fe基超导体中最简单的结构。我们在所有费米表面上发现了各向同性的超导间隙,这些间隙的大小可以通过强耦合方法衍生的单个间隙函数进行拟合,从而促进了局部反铁磁交换相互作用,成为配对起点的重要候选者。

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  • 来源
    《Physical review》 |2012年第9期|p.094506.1-094506.6|共6页
  • 作者单位

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan,TRiP, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan;

    Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

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

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

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

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

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan,WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

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  • 正文语种 eng
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  • 关键词

    nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal fermi liquid, luttinger liquid, etc.); electronic structure;

    机译:非常规机制(自旋涨落;极化子和双极化子;共振价键模型;任意子机制;边缘费米液体;卢汀液体等);电子结构;

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