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首页> 外文期刊>Physical review >Tracing the s_± symmetry in iron pnictides by controlled disorder
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Tracing the s_± symmetry in iron pnictides by controlled disorder

机译：通过控制性失调追踪铁肽中的s_±对称性

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摘要

Determining the symmetry of the superconducting order parameter is the most important but also the most complicated step in elucidating the mechanism of superconductivity. Here we present an experimental approach to investigate the order parameter symmetry of unconventional multiband superconductors, which is based on a disorder-induced change from sign-reversed (s_±) to sign-preserved (s_(++)) symmetry. Therefore, we investigated a Ba(Fe_(0.9)Co_(0.1))_2As_2 thin film by THz spectroscopy and stepwise proton irradiation. In our experiments, the low-energy superconducting gap first vanishes but recovers at higher irradiation doses. At the same time, the decrease of the superfluid density with disorder comes to a halt. Thus, we confirm with the method presented here that the superconducting order parameter in the pristine sample possesses s_± symmetry.
机译：确定超导参数的对称性是阐明超导机理的最重要但也是最复杂的步骤。在这里，我们提出了一种实验方法来研究非常规多频带超导体的阶跃参数对称性，它基于无序引起的从符号反转（s_±）到符号保留（s _（++））对称性的变化。因此，我们通过太赫兹光​​谱和逐步质子辐照研究了Ba（Fe_（0.9）Co_（0.1））_ 2As_2薄膜。在我们的实验中，低能超导间隙首先消失，但在较高的辐照剂量下会恢复。同时，随着紊乱，超流体密度的下降停止了。因此，我们用这里介绍的方法确认原始样品中的超导阶参数具有s_±对称性。

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  • 来源
    《Physical review》 |2016年第17期|174515.1-174515.5|共5页
  • 作者

    M. B. Schilling; A. Baumgartner; B. Gorshunov; E. S. Zhukova; V. A. Dravin; K. V. Mitsen; D. V. Efremov; O. V. Dolgov; K. Iida; M. Dressel; S. Zapf;

  • 作者单位

    1. Physikalisches Institut, Universitaet Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany;

    1. Physikalisches Institut, Universitaet Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany;

    1. Physikalisches Institut, Universitaet Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany,A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia,Moscow Institute of Physics and Technology (State University), 141700, Dolgoprudny, Moscow Region, Russia;

    1. Physikalisches Institut, Universitaet Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany,A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia,Moscow Institute of Physics and Technology (State University), 141700, Dolgoprudny, Moscow Region, Russia;

    P. N. Lebedev Physical Institute, Moscow, 119991 Russia;

    P. N. Lebedev Physical Institute, Moscow, 119991 Russia;

    Institute for Theoretical Solid State Physics, IFW Dresden, Germany;

    Max-Planck Institut fuer Festkoerperforschung, 70569 Stuttgart, Germany,P. N. Lebedev Physical Institute, Moscow, 119991 Russia;

    Institute for Metallic Materials, IFW Dresden, Germany,Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan;

    1. Physikalisches Institut, Universitaet Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany;

    1. Physikalisches Institut, Universitaet Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany;

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