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首页> 外文期刊>Physical review >Superconducting fluctuations in isovalently substituted BaFe_2(As_(1-x)P_x)_2: Possible observation of multiband effects
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Superconducting fluctuations in isovalently substituted BaFe_2(As_(1-x)P_x)_2: Possible observation of multiband effects

机译：等价取代的BaFe_2（As_（1-x）P_x）_2中的超导涨落：可能观察到多带效应

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摘要

The nature of superconducting fluctuation effects in the isovalently substituted iron pnictide BaFe_2(As_(1-x)P_x)_2 (x ≈ 0.35) is probed through measurements of the magnetization and magnetoconductivity around the superconducting transition. The results, obtained with magnetic fields up to 9 T applied in the two main crystal directions, are consistent with anisotropic Ginzburg-Landau (GL) approaches for finite applied magnetic fields. The analysis allowed us to determine with accuracy the out-of-plane, ξ_c(0), and in-plane, ξ_(ab)(0), GL coherence lengths. Significant differences are found between the ξ_c(0) values resulting from electrical transport and magnetization data. According to recent theoretical approaches, these differences could be interpreted in terms of the multiband nature of this material. The analysis of data in the low-field region around the transition temperature also suggests that phase fluctuations, although possibly relevant in other Fe-based superconductors, may play a negligible role in this compound.
机译：通过测量超导跃迁周围的磁化强度和磁导率，探讨了等价取代的铁素体BaFe_2（As_（1-x）P_x）_2（x≈0.35）中超导波动效应的性质。在两个主晶体方向上施加高达9 T的磁场所获得的结果与有限施加磁场的各向异性Ginzburg-Landau（GL）方法一致。通过分析，我们可以精确确定平面外ξ_c（0）和平面内ξ_（ab）（0），GL相干长度。从电传输和磁化数据得出的ξ_c（0）值之间存在显着差异。根据最新的理论方法，可以根据这种材料的多频带性质来解释这些差异。对转变温度附近低场区域数据的分析还表明，尽管可能与其他基于Fe的超导体有关，但相位波动在该化合物中的作用可忽略不计。

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  • 来源
    《Physical review》 |2015年第9期|094508.1-094508.11|共11页
  • 作者

    A. Ramos-Alvarez; J. Mosqueira; F. Vidal; Ding Hu; Genfu Chen; Huiqian Luo; Shiliang Li;

  • 作者单位

    LBTS, Departamento de Fisica da Materia Condensada, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain;

    LBTS, Departamento de Fisica da Materia Condensada, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain;

    LBTS, Departamento de Fisica da Materia Condensada, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;

    Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    magnetic properties;

    机译：磁性;

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