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Absence of vortex lattice melting in a high-purity Nb superconductor

机译:高纯度Nb超导体中没有涡旋晶格熔化

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摘要

The state of the vortex lattice extremely close to the superconducting to normal transition in an applied magnetic field is investigated in high-purity niobium. We observe that thermal fluctuations of the order parameter broaden the superconducting to normal transition into a crossover but no sign of a first-order vortex lattice melting transition is detected in measurements of the heat capacity or the small-angle neutron scattering (SANS) intensity. Direct observation of the vortices via SANS always finds a well-ordered vortex lattice. The fluctuation broadening is considered in terms of the lowest Landau-level theory of critical fluctuations and scaling is found to occur over a large H_(c2)(T) range.
机译:在高纯度铌中研究了涡旋晶格的状态,该状态非常接近于超导磁场在正常磁场中的超导转变。我们观察到,阶跃参数的热涨落将超导扩宽为正态转变为交叉,但是在热容或小角度中子散射(SANS)强度的测量中未检测到一阶涡旋晶格熔融转变的迹象。通过SANS对涡旋的直接观察总是会发现有序的涡旋晶格。根据最低的Landau级临界波动理论来考虑波动变宽,并且发现在较大的H_(c2)(T)范围内会发生缩放。

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  • 来源
    《Physical review》 |2010年第14期|p.144508.1-144508.8|共8页
  • 作者单位

    School of Physics and Astronomy, The University of Birmingham, Birmingham B15 2TT, United Kingdom,Department of Materials Science and Metallurgy,University of Cambridge CB2 3QZ, UK;

    School of Physics and Astronomy, The University of Birmingham, Birmingham B15 2TT, United Kingdom;

    Laboratory for Neutron Scattering, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;

    Institut Laue Langevin, BP 156, F-38042 Grenoble, France;

    Institut Laue Langevin, BP 156, F-38042 Grenoble, France;

    School of Physics and Astronomy, The University of Birmingham, Birmingham B15 2TT, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    thermodynamic properties; metals; alloys and binary compounds (including a15; mgb2; etc.);

    机译:热力学性质;金属;合金和二元化合物(包括a15;mgb2等);

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