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Anomalous thermodynamic power laws near topological transitions in nodal superconductors

机译：节点超导体拓扑转变附近的热力学异常功率定律

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摘要

Unconventional superconductors are most frequently identified by the observation of power-law behavior on low-temperature thermodynamic or transport properties, such as specific heat. Here, we show that, in addition to the usual point and line nodes, a much wider class of different nodal types can occur. These new types of nodes typically occur when there are transitions between different types of gap node topology, for example, when point or line nodes first appear as a function of some physical parameter. We identify anomalous, noninteger thermodynamic power laws associated with these new nodal types, and give physical examples of superconductors in which they might be observed experimentally, including the noncentrosymmetric superconductor Li_2Pd_(3-x)Pt_xB.
机译：通过观察关于低温热力学或传输特性（例如比热）的幂律行为，可以最经常地识别出非常规超导体。在这里，我们表明，除了通常的点和线节点外，还会出现更多种类的不同节点类型。这些新类型的节点通常会在不同类型的间隙节点拓扑之间存在转换时发生，例如，当点或线节点首先根据某些物理参数出现时。我们确定了与这些新节点类型相关的异常，非整数热力学功率定律，并给出了可以通过实验观察到的超导体的物理示例，包括非中心对称超导体Li_2Pd_（3-x）Pt_xB。

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  • 来源
    《Physical review》 |2013年第22期|224504.1-224504.7|共7页
  • 作者

    B. Mazidian; J. Quintanilla; A. D. Hillier; J. F. Annett;

  • 作者单位

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom,ISIS facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxfordshire, OX11 0QX, United Kingdom;

    ISIS facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxfordshire, OX11 0QX, United Kingdom,SEPnet and Hubbard Theory Consortium, School of Physical Sciences, University of Kent, Canterbury CT2 7NH, United Kingdom;

    ISIS facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxfordshire, OX11 0QX, United Kingdom;

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    thermodynamic properties; pairing symmetries (other than s-wave); electronic structure; heavy-fermion superconductors;

    机译：热力学性质;配对对称性（s波除外）;电子结构重费米子超导体;

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