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Crossover from weak to strong pairing in unconventional superconductors

机译：非常规超导体从弱配对到强配对的交叉

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摘要

Superconductors are classified by their pairing mechanism and the coupling strength, measured as the ratio of the energy gap, 2△, to the critical temperature, T_c. We present an extensive comparison of the 2△A/k_BT_c ratios among many single- and multiband superconductors from simple metals to high-T_c cuprates and iron pnictides. Contrary to the recently suggested universality of this ratio in Fe-based superconductors, we find that the coupling in pnictides ranges from weak, near the BCS limit, to strong, as in cuprates, bridging the gap between these two extremes. Moreover, for Fe- and Cu-based materials, our analysis reveals a universal correlation between the gap ratio and T_c, which is not found in conventional superconductors and therefore supports a common unconventional pairing mechanism in both families. An important consequence of this result for ferropnictides is that the separation in energy between the excitonic spin-resonance mode and the particle-hole continuum, which determines the resonance damping, no longer appears independent of T_c.
机译：超导体根据其配对机制和耦合强度（以能隙2△与临界温度T_c的比值进行测量）进行分类。我们对许多单波段和多波段超导体中的2△A / k_BT_c比率进行了广泛的比较，从简单金属到高T_c铜酸盐和铁磷化物。与最近建议的在铁基超导体中该比率的普遍性相反，我们发现，磷化物的耦合范围从弱到接近BCS极限，到强到像铜酸盐一样，弥合了这两个极端之间的差距。此外，对于铁基和铜基材料，我们的分析显示出间隙比和T_c之间存在普遍的相关性，这在常规超导体中是不存在的，因此支持两个族中常见的非常规配对机制。该结果对于亚铁肽的重要结果是，在激子自旋共振模式与确定共振阻尼的粒子-空穴连续体之间的能量分离不再依赖于T_c。

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  • 来源
    《Physical review》 |2011年第21期|p.214520.1-214520.14|共14页
  • 作者

    D. S. Inosov; J. T. Park; A. Charnukha; Yuan Li; A. V. Boris; B. Keimer; V. Hinkov;

  • 作者单位

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany,Department of Physics, Loughborough University, LEI I 3TU Loughborough, United Kingdom;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany,Department of Physics and Astronomy, University of British Columbia, V6T1Z2 Vancouver, Canada;

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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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