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Evidence for nodal superconductivity in quasi-one-dimensional K_2Cr_3As_3

机译：准一维K_2Cr_3As_3中节点超导的证据

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摘要

The recent discovery of superconductivity in the quasi-one-dimensional compound K_2Cr_3As_3, which consists of double-walled tubes of [(Cr_3As_3)~(2-)]~∞ that run along the c axis, has attracted immediate attention as a potential system for studying superconductors with reduced dimensionality. Here we report clear experimental evidence for the unconventional nature of the superconducting order parameter in K_2Cr_3As_3, by precisely measuring the temperature dependence of the change in the penetration depth AX(T) using a tunnel-diode oscillator. Linear behavior of Δλ(T) is observed for T 《 T_c, instead of the exponential behavior of conventional superconductors, indicating that there are line nodes in the superconducting gap. This is strong evidence for unconventional behavior and may provide key information for identifying the pairing state of this superconductor.
机译：准一维化合物K_2Cr_3As_3中的超导性的最新发现是由[[Cr_3As_3）〜（2-）]〜∞沿c轴延伸的双壁管组成，作为一个潜在系统引起了人们的立即关注。用于研究尺寸减小的超导体。在这里，我们通过使用隧道二极管振荡器精确测量穿透深度AX（T）的变化的温度依赖性，为K_2Cr_3As_3中的超导阶数参数的非常规性质报告了清晰的实验证据。对于T《 T_c，观察到了Δλ（T）的线性行为，而不是传统的超导体的指数行为，这表明在超导间隙中存在线节点。这是非常规行为的有力证据，并且可以提供关键信息来识别该超导体的配对状态。

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  • 来源
    《Physical review》 |2015年第22期|220502.1-220502.6|共6页
  • 作者

    G. M. Pang; M. Smidman; W. B. Jiang; J. K. Bao; Z. F. Weng; Y. F. Wang; L. Jiao; J. L. Zhang; G. H. Cao; H. Q. Yuan;

  • 作者单位

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

    Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;

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  • 正文语种 eng
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  • 关键词

    magnetic properties; pairing symmetries (other than s-wave); thermodynamic properties;

    机译：磁性配对对称性（s波除外）;热力学性质;

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