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首页> 外文期刊>Physical review >Coexistence of type-Ⅰ and type-Ⅱ superconductivity signatures in ZrB_(12) probed by muon spin rotation measurements
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Coexistence of type-Ⅰ and type-Ⅱ superconductivity signatures in ZrB_(12) probed by muon spin rotation measurements

机译：Ⅰ型和Ⅱ型超导鉴定型Ⅰ型和Ⅱ型超导签名的共存，ZRB_（12）探测MUON旋转旋转测量

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摘要

Superconductors usually display either type-Ⅰ or type-Ⅱ superconductivity and the coexistence of these two types in the same material, for example, at different temperatures, is rare in nature. We employed the muon spin rotation (μSR) technique to unveil the superconducting phase diagram of the dodecaboride ZrB_(12) and obtained clear evidence of both type-Ⅰ and type-Ⅱ characteristics. Most important, we found a region showing unusual behavior where the usually mutually exclusive μSR signatures of type-Ⅰ and type-Ⅱ superconductivity coexist. We reproduced that behavior in theoretical modeling that required taking into account multiple bands and multiple coherence lengths, which suggests that material has one coherence length larger and another smaller than the magnetic field penetration length (the type-1.5 regime). At stronger fields, a footprint of the type-Ⅱ mixed state showing square flux-line lattice was also obtained using neutron diffraction.
机译：超导体通常显示Ⅰ型或Ⅱ型超导性，并且在相同材料中的这两种类型的共存，例如，在不同的温度下，是罕见的。我们采用MuOn旋转旋转（μSR）技术推出十二章杂交ZRB_（12）的超导相图，并获得了Ⅰ型和Ⅱ型特性的清晰证据。最重要的是，我们发现了一个地区，显示了Ⅰ型和Ⅱ型超导共存的通常相互排斥的μSR签名。我们在理论模型中复制了考虑到多个带和多个相干长度的理论建模的行为，这表明材料具有一个相干长度越大，另一个小于磁场穿透长度（1.5型制度）。在较强的领域，使用中子衍射也获得了显示方向磁通线晶格的Ⅱ型混合状态的占地面积。

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  • 来源
    《Physical review》 |2020年第14期|144523.1-144523.6|共6页
  • 作者

    P. K. Biswas; F. N. Rybakov; R. P. Singh; Saumya Mukherjee; N. Parzyk; G. Balakrishnan; M. R. Lees; C. D. Dewhurst; E. Babaev; A. D. Hillier; D. Mc K. Paul;

  • 作者单位

    ISIS Pulsed Neutron and Muon Source STFC Rutherford Appleton Laboratory Harwell Campus Didcot Oxfordshire OX11 0QX United Kingdom;

    Department of Physics KTH Royal Institute of Technology SE-10691 Stockholm Sweden;

    Indian Institute of Science Education and Research Bhopal Bhopal 462066 India;

    Diamond Light Source Oxfordshire OX11 0DE United Kingdom Clarendon Laboratory Department of Physics University of Oxford Parks Road Oxford OX1 3PU United Kingdom;

    Physics Department University of Warwick Coventry CV4 7AL United Kingdom;

    Physics Department University of Warwick Coventry CV4 7AL United Kingdom;

    Physics Department University of Warwick Coventry CV4 7AL United Kingdom;

    Institut Laue Langevin 6 Rue Jules Horowitz 38042 Grenoble France;

    Department of Physics KTH Royal Institute of Technology SE-10691 Stockholm Sweden;

    ISIS Pulsed Neutron and Muon Source STFC Rutherford Appleton Laboratory Harwell Campus Didcot Oxfordshire OX11 0QX United Kingdom;

    Physics Department University of Warwick Coventry CV4 7AL United Kingdom;

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