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首页> 外文期刊>Physical review letters >Evidence for a Nodal Energy Gap in the Iron-Pnictide Superconductor LaFePO from Penetration Depth Measurements by Scanning SQUID Susceptometry
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Evidence for a Nodal Energy Gap in the Iron-Pnictide Superconductor LaFePO from Penetration Depth Measurements by Scanning SQUID Susceptometry

机译：通过扫描SQUID磁敏感度法测量穿透深度来测量铁-铁超导体LaFePO中的节点能隙

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摘要

We measure changes in the penetration depth λ of the T_c ≈ 6 K superconductor LaFePO. In the process, scanning SQUID susceptometry is demonstrated as a technique for accurately measuring local temperature-dependent changes in A, ideal for studying early or difficult-to-grow materials. A is found to vary linearly with temperatures from 0.36 to ～2 K, with a slope of 143 ± 15 A/K, suggesting line nodes in the superconducting order parameter. The linear dependence up to ～T_c/3, similar to the cuprate superconductors, indicates well-developed nodes.
机译：我们测量了T_c≈6 K超导体LaFePO的穿透深度λ的变化。在此过程中，扫描SQUID磁化法被证明是一种精确测量A中随温度变化的技术，非常适合研究早期或难以生长的材料。发现A随温度从0.36到〜2 K线性变化，斜率为143±15 A / K，表明超导阶数参数中的线节点。与铜酸盐超导体相似，线性相关性高达〜T_c / 3，表明节点发达。

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  • 来源
    《Physical review letters》 |2009年第12期|127003.1-127003.4|共4页
  • 作者

    Clifford W. Hicks; Thomas M. Lippman; Martin E. Huber; James G. Analytis; Jiun-Haw Chu; Ann S. Erickson; Ian R. Fisher; Kathryn A. Moler;

  • 作者单位

    Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    Departments of Physics and Electrical Engineering, University of Colorado Denver, Denver, Colorado, 80217, USA;

    Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

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  • 关键词

    response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.); pairing symmetries (other than s-wave);

    机译：对电磁场的响应（核磁共振;表面阻抗等）;配对对称（s波除外）;

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