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Experimental test of strong pinning and creep in current-voltage characteristics of type-Ⅱ superconductors

机译:Ⅱ型超导体电流电压特性强钉扎和蠕变的实验试验

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Pinning and creep determine the current-voltage characteristics of a type-II superconductor and thereby its potential for technological applications. The recent development of strong pinning theory provides us with a tool to assess a superconductor's electric properties in a quantitative way. Motivated by the observation of typical excess-current characteristics and field scaling of critical currents, here we analyze current-voltage characteristics measured on 2H-NbSe2 and a-MoGe type-II superconductors within the setting provided by strong pinning theory. The experimentally observed shift and rounding of the voltage onset is consistent with the predictions of strong pinning in the presence of thermal fluctuations. We find the underlying parameters determining pinning and creep and discuss their consistency.
机译:固定和蠕变确定II型超导体的电流 - 电压特性,从而实现了技术应用的可能性。最近的强钉理论的发展为我们提供了一种以定量方式评估超导体的电性能。通过观察典型的过度电流特性和临界电流场缩放的动机,在这里,我们分析了通过强钉扎理论提供的设置内的2H-NBSE2和A-Moge-II超导体上测量的电流电压特性。实验观察到的电压发作的换档和舍入是一致的,与热波动存在的强钉扎的预测一致。我们发现潜在的参数确定循环和蠕变,并讨论它们的一致性。

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  • 来源
    《Physical review》 |2019年第22期|224502.1-224502.11|共11页
  • 作者单位

    EIH Zurich Inst Theoret Phys CH-8093 Zurich Switzerland;

    Argonne Natl Lab Mat Sci Div Lemont IL 60439 USA;

    Tata Inst Fundamental Res Homi Bhabha Rd Mumbai 400005 Maharashtra India;

    Rutgers State Univ Dept Phys & Astron Piscataway NJ 08855 USA;

    Tata Inst Fundamental Res Homi Bhabha Rd Mumbai 400005 Maharashtra India;

    EIH Zurich Inst Theoret Phys CH-8093 Zurich Switzerland;

    EIH Zurich Inst Theoret Phys CH-8093 Zurich Switzerland;

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