零外加场中FeSe0.5Te0.5超导刚度和相干长度的测量

IF 1.9 Q3 PHYSICS, CONDENSED MATTER
Amotz Peri, I. Mangel, A. Keren
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引用次数: 1

摘要

超导刚度ρs和相干长度ξ通常分别通过测量磁场的穿透深度λ和超导体(SC)的上临界场Hc2来确定。然而,在铁基磁性SC中,这可能会导致错误的结果,因为内部磁场可能与施加的磁场非常不同。为了克服Fe1+ySexTe1−x中x~0.5和y~0(FST)的这一问题,我们使用刚度计技术测量了这两个量。在这种技术中,将转子自由矢量势a应用于超导环,并通过环的磁矩m测量电流密度j。ρs和ξ由伦敦方程j=-ρsA及其有效范围确定。该方法在接近临界温度Tc的温度下尤其准确。我们发现,与现有文献报道相比,ρs较弱,ξ较长,临界指数更符合基于Ginzburg–Landau理论的预期。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Superconducting Stiffness and Coherence Length of FeSe0.5Te0.5 Measured in a Zero-Applied Field
Superconducting stiffness ρs and coherence length ξ are usually determined by measuring the penetration depth λ of a magnetic field and the upper critical field Hc2 of a superconductor (SC), respectively. However, in magnetic SC, which is iron-based, this could lead to erroneous results, since the internal field could be very different from the applied one. To overcome this problem in Fe1+ySexTe1−x with x∼0.5 and y∼0 (FST), we measured both quantities with the Stiffnessometer technique. In this technique, one applies a rotor-free vector potential A to a superconducting ring and measures the current density j via the ring’s magnetic moment m. ρs and ξ are determined from London’s equation, j=−ρsA, and its range of validity. This method is particularly accurate at temperatures close to the critical temperature Tc. We find weaker ρs and longer ξ than existing literature reports, and critical exponents which agree better with expectations based on the Ginzburg–Landau theory.
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来源期刊
Condensed Matter
Condensed Matter PHYSICS, CONDENSED MATTER-
CiteScore
2.90
自引率
11.80%
发文量
58
审稿时长
10 weeks
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