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Kerr rotation in the unconventional superconductor Sr_2RuO_4

机译：非常规超导体Sr_2RuO_4中的Kerr旋转

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摘要

The interpretation of Kerr rotation measurements in the superconducting phase of Sr_2RuO_4 is a controversial topic. Both intrinsic and extrinsic mechanisms have been proposed, and it has been argued that the intrinsic response vanishes by symmetry. We focus on the intrinsic contribution and clarify several conflicting results in the literature. On the basis of symmetry considerations and detailed calculations, we show that the intrinsic Ken-signal is not forbidden in a general multiband system but has a rich structure in the near-infrared regime. We distinguish different optical transitions determined by the superconducting gap (far infrared) and the interorbital coupling of the normal state (near infrared). We argue that the low-frequency transitions do not contribute to the Hall conductivity, while only the interorbital transitions in the near-infrared regime contribute. Finally, we discuss the difficulties to connect the calculations for the optical Hall conductivity to the experimental measurement of the Kerr angle. We will compare different approximations which might lead to conflicting results.
机译：Sr_2RuO_4超导相中Kerr旋转测量的解释是一个有争议的话题。内在机制和外在机制都已被提出，并且有人认为内在响应因对称性而消失。我们关注内在贡献，并阐明文献中的一些矛盾结果。基于对称性考虑和详细的计算，我们表明，固有的Ken信号在一般的多频带系统中不是被禁止的，但是在近红外领域具有丰富的结构。我们区分由超导间隙（远红外）和正常状态的轨道间耦合（近红外）确定的不同光学跃迁。我们认为，低频跃迁对霍尔电导率没有贡献，而近红外区域中只有轨道间跃迁起作用。最后，我们讨论了将光学霍尔电导率的计算与Kerr角的实验测量联系起来的困难。我们将比较可能导致冲突结果的不同近似值。

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  • 来源
    《Physical review》 |2013年第9期|094504.1-094504.8|共8页
  • 作者

    Martin Gradhand; Karol I. Wysokinski; James F. Annett; Balazs L. Gyoerffy;

  • 作者单位

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Ave, BS8-ITL, United Kingdom;

    Institute of Physics, M. Curie-Sklodowska University, Radziszewskiego 10, PL-20-031 Lublin, Poland;

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Ave, BS8-ITL, United Kingdom;

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Ave, BS8-ITL, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    optical properties; ruthenates;

    机译：光学性质钌酸;

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