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Upper critical field of the noncentrosymmetric superconductor BiPd

机译:非中心对称超导体BiPd的上临界场

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摘要

The superconducting parameters and upper critical field of the noncentrosymmetric superconductor BiPd have proven contentious. This material is of particular interest because it is a rare example of a 4f-electron-free noncentrosymmetric superconductor of which crystals may be grown and cleaved, enabling surface-sensitive spectroscopies. Here, using bulk probes augmented by tunneling data on defects, we establish that the lower of the previously reported upper critical fields corresponds to the bulk transition. The material behaves as a nearly weak-coupled BCS s-wave superconductor, and we report its superconducting parameters as drawn from the bulk upper critical field. Possible reasons behind the order-of-magnitude discrepancy in the reported upper critical fields are discussed.
机译:非中心对称超导体BiPd的超导参数和上临界场已被证明是有争议的。这种材料特别受关注,因为它是不含4f电子的非中心对称超导体的稀有实例,其晶体可以生长和裂解,从而可以进行表面敏感的光谱学研究。在这里,使用通过在缺陷上建立隧道数据来增强的体探针,我们确定先前报告的上临界场的下部对应于体转变。该材料表现为几乎弱耦合的BCS s波超导体,我们报告了从整体上临界场得出的超导参数。讨论了所报告的上临界字段中的数量级差异背后的可能原因。

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  • 来源
    《Physical review》 |2016年第17期|174504.1-174504.6|共6页
  • 作者单位

    Max-Planck-Institut fuer Festkoerperforschung, Stuttgart D-70569, Germany,Centerfor Correlated Electron Systems, Institute for Basic Science, Seoul National University, Seoul 08826, Korea,Advanced Materials Laboratory, Fudan University, Shanghai 200438, China;

    Max-Planck-Institut fuer Festkoerperforschung, Stuttgart D-70569, Germany,School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, United Kingdom;

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

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

    Max-Planck-Institut fuer Festkoerperforschung, Stuttgart D-70569, Germany,School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, United Kingdom;

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

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