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Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals

机译:FeSe单晶通过点状无序和各向异性能隙提高超导转变温度

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摘要

A highly anisotropic superconducting gap is found in single crystals of FeSe by studying the London penetration depth Δλ. measured down to 50 mK in samples before and after 2.5 MeV electron irradiation. The gap minimum increases with introduced pointlike disorder, indicating the absence of symmetry-imposed nodes. Surprisingly, the superconducting transition temperature T_c increases by 0.4 K from T_(c0) ≈ 8.8 K while the structural transition temperature T_s decreases by 0.9 K from T_(s0) ≈ 91.2 K after electron irradiation. We discuss several explanations for the T_c enhancement and propose that local strengthening of the pair interaction by irradiation-induced Frenkel defects most likely explains the phenomenon.
机译:通过研究伦敦穿透深度Δλ,在FeSe单晶中发现了高度各向异性的超导间隙。在2.5 MeV电子辐照之前和之后,样品中的低至50 mK。间隙最小值随着引入的点状无序而增加,表明不存在对称施加的节点。令人惊讶的是,电子辐照后,超导转变温度T_c从T_(c0)≈8.8 K增加了0.4 K,而结构转变温度T_s从T_(s0)≈91.2 K降低了0.9K。我们讨论了T_c增强的几种解释,并提出通过辐照引起的Frenkel缺陷对对相互作用的局部增强最有可能解释了这一现象。

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  • 来源
    《Physical review》 |2016年第6期|064521.1-064521.8|共8页
  • 作者单位

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Laboratoire des Solides Irradis, Ecole Polytechnique, CNRS, CEA, Universit Paris-Saclay, 91128 Palaiseau Cedex, France;

    Joint Institute of Computational Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Department of Physics, University of Florida, Gainesville, Florida 32611, USA;

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA;

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