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Single 20 meV boson mode in KFe_2As_2 detected by point-contact spectroscopy

机译:点接触光谱法在KFe_2As_2中检测到20 meV玻色子单模

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摘要

We report an experimental and theoretical investigation of the electron-boson interaction in KFe_2As_2 by point-contact (PC) spectroscopy, model, and ab initio local density approximation-based calculations for the standard electron-phonon Eliashberg function. The PC spectrum viz. the second derivative of the Ⅰ-Ⅴ characteristic of representative PC exhibits a pronounced maximum at about 20 meV and surprisingly a featureless behavior at lower and higher energies. We discuss phonon and nonphonon (excitonic) mechanisms for the origin of this peak. Analysis of the underlying source of this peak may be important for the understanding of serious puzzles of superconductivity in this type of compound.
机译:我们通过点接触(PC)光谱,模型和从头算局部密度近似的标准电子声子Eliashberg函数计算,报告了在KFe_2As_2中电子-玻色子相互作用的实验和理论研究。 PC频谱即。具有代表性的PC的Ⅰ-Ⅴ特性的二阶导数在约20meV处表现出明显的最大值,而在较低和较高能量下却表现出无特征的行为。我们讨论了声子和非声子(激子)机制的峰的起源。分析此峰的潜在来源对于理解此类化合物中的超导性严重难题可能至关重要。

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  • 来源
    《Physical review》 |2014年第9期|094505.1-094505.9|共9页
  • 作者单位

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Ave., 61103,Kharkiv, Ukraine;

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Ave., 61103,Kharkiv, Ukraine;

    B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Ave., 61103,Kharkiv, Ukraine;

    Technische Universitaet Graz, 5150 Institut fuer Theoretische Physik-Computational Physics Petersgasse 16/Ⅱ, 8010 Graz, Austria;

    Leibniz-Institut fuer Festkorper- und Werkstoffforschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

    Leibniz-Institut fuer Festkorper- und Werkstoffforschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

    Leibniz-Institut fuer Festkorper- und Werkstoffforschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

    Leibniz-Institut fuer Festkorper- und Werkstoffforschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

    Leibniz-Institut fuer Festkorper- und Werkstoffforschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

    Leibniz-Institut fuer Festkorper- und Werkstoffforschung Dresden e.V, Postfach 270116, D-01171 Dresden, Germany;

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  • 正文语种 eng
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  • 关键词

    polarons and electron-phonon interactions; nuclear magnetic resonance and relaxation; ternary, quaternary and multinary compounds (including Chevrel phases, borocarbides, etc.);

    机译:极化子和电子-声子相互作用;核磁共振和弛豫;三元;四元和多元化合物(包括Chevrel相;硼碳化物等);

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