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首页> 外文期刊>Physical review >Vortices in superconducting Ba(Fe_(0.93)Co_(0.07))_2As_2 studied via small-angle neutron scattering and Bitter decoration
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Vortices in superconducting Ba(Fe_(0.93)Co_(0.07))_2As_2 studied via small-angle neutron scattering and Bitter decoration

机译:小角中子散射和苦味修饰研究Ba(Fe_(0.93)Co_(0.07))_ 2As_2超导中的涡旋

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摘要

We present small-angle neutron scattering (SANS) and Bitter decoration studies of the superconducting vortices in Ba(Fe_(0.93)Co_(0.07))_2As_2- A highly disordered vortex configuration is observed at all measured fields and is attributed to strong pinning. This conclusion is supported by the absence of a Meissner rim in decoration images obtained close to the sample edge. The field dependence of the magnitude of the SANS scattering vector indicates vortex lattice domains of (distorted) hexagonal symmetry, consistent with the decoration images which show primarily sixfold coordinated vortex domains. An analysis of the scattered intensity shows that this decreases much more rapidly than expected from estimates of the upper critical field, consistent with the large degree of disorder.
机译:我们目前在Ba(Fe_(0.93)Co_(0.07))_ 2As_2-中的超导涡流进行小角度中子散射(SANS)和苦味装饰研究。在所有测量场中都观察到高度无序的涡流构型,这归因于强钉扎作用。该结论得到了靠近样品边缘获得的装饰图像中没有迈斯纳边缘的支持。 SANS散射矢量大小的场依赖性表明(扭曲)六边形对称的涡旋晶格域,与装饰图像一致,该装饰图像主要显示了六重协调的涡旋域。对散射强度的分析表明,与高度临界场的估计值相比,散射强度的下降速度要比预期的快得多。

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  • 来源
    《Physical review》 |2009年第10期|69-72|共4页
  • 作者单位

    Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA;

    Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia;

    Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA;

    Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia;

    Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia;

    Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA;

    Institut Laue-Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France;

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

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

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

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

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

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  • 正文语种 eng
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  • 关键词

    vortex lattices, flux pinning, flux creep; ternary, quaternary and multinary compounds (including Chevrel phases, borocarbides, etc.);

    机译:旋涡晶格;磁通钉扎;磁通蠕变;三元;四元和多元化合物(包括Chevrel相;硼碳化物等);

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