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首页> 外文期刊>Physical review >Evidence of d-wave superconductivity in K_(1-x)Na_xFe_2As_2(x =0,0.1)single crystals from low-temperature specific-heat measurements
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Evidence of d-wave superconductivity in K_(1-x)Na_xFe_2As_2(x =0,0.1)single crystals from low-temperature specific-heat measurements

机译:低温比热法测量K_(1-x)Na_xFe_2As_2(x = 0,0.1)单晶中d波超导的证据

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摘要

From the measurement and analysis of the specific heat of high-quality K_(1-x)Na_xFe_2As_2 single crystals we establish the presence of large T~2 contributions with coefficients a_(sc) ≈ 30 mj/mol K~3 at low T for both x = 0 and x =0.1.Together with the observed B~(1/2) behavior of the specific heat in the superconducting state both findings give evidence of d-wave superconductivity on almost all Fermi-surface sheets with an average gap amplitude of Δ_0 in the range of 0.4-0.8 meV.The derived Δ_0 and observed T_c agree well with the values calculated within Eliashberg theory, adopting a spin-fluctuation mediated pairing in the intermediate coupling regime.
机译:通过对高质量K_(1-x)Na_xFe_2As_2单晶的比热的测量和分析,我们发现在低T下,存在大的T〜2贡献,系数为a_(sc)≈30 mj / mol K〜3。 x = 0和x = 0.1。再加上在超导状态下观察到的比热的B〜(1/2)行为,这两个发现都为几乎所有费米表面上平均间隙幅度的d波超导提供了证据。 Δ_0的范围在0.4-0.8 meV之间。推导的Δ_0和观察到的T_c与Eliashberg理论中计算的值非常吻合,在中间耦合机制中采用了自旋涨落介导的配对。

著录项

  • 来源
    《Physical review》 |2013年第18期|180507.1-180507.4|共4页
  • 作者单位

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany,Lomonosov Moscow State University, GSP-1,Leninskie Gory,Moscow,119991,Russian Federation;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany,Dept.of Physics and Astronomy,University of British Columbia,Vancouver,British Columbia,Canada V6T 1Z1;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany,Institut fuer Theoretische Physik,TU Dresden,D-01062 Dresden, Germany;

    Max-Planck Institute for Chemical Physics of Solids,D-01187 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany,Institut fuer Festkoerperphysik,TU Dresden, D-01062 Dresden, Germany;

    Dresden High Magnetic Field Laboratory,Helmholtz-Zentrum Dresden-Rossendorf,01314 Dresden, Germany;

    Institut fuer Festkoerperphysik,TU Dresden, D-01062 Dresden, Germany,Dresden High Magnetic Field Laboratory,Helmholtz-Zentrum Dresden-Rossendorf,01314 Dresden, Germany;

    Kirchhoff-Institute for Physics, University of Heidelberg,D-69120 Heidelberg,Germany;

    Kirchhoff-Institute for Physics, University of Heidelberg,D-69120 Heidelberg,Germany;

    Kirchhoff-Institute for Physics, University of Heidelberg,D-69120 Heidelberg,Germany;

    Kirchhoff-Institute for Physics, University of Heidelberg,D-69120 Heidelberg,Germany;

    Kirchhoff-Institute for Physics, University of Heidelberg,D-69120 Heidelberg,Germany;

    Leibniz Institute for Solid State and Materials Research,IFW-Dresden, D-01171 Dresden, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    superconductivity phase diagrams; electronic structure;

    机译:超导相图;电子结构;

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