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首页> 外文期刊>Physical review >Two-band Bardeen-Cooper-Schrieffer superconducting state of the iron pnictide compound Ba(Fe_(0.9)Co_(0.1)_2As_2
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Two-band Bardeen-Cooper-Schrieffer superconducting state of the iron pnictide compound Ba(Fe_(0.9)Co_(0.1)_2As_2

机译:磷化铁化合物Ba(Fe_(0.9)Co_(0.1)_2As_2的两能带Bardeen-Cooper-Schrieffer超导态

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摘要

Theopticalconductivity and permittivity spectra of Ba(Fe_(0.9)Co_(0.1))_2As_2 films(T_c = 20 K) are analyzed together with the literature data on photoemission and specific heat. In the superconducting state at all temperatures up to T_c the temperature dependence of the magnetic field penetration depth is well described within the generalized two-band BCS model with intraband and interband pairing interactions considered. It is shown that the small superconducting energy gap 2Δ~(1) = 3.7 meV develops in the electron subsystem while the larger gap 2Δ~(2) = 7.9 meV opens in the hole subsystem. The normal state parameters, such as plasma frequency and scattering rate, of electron and hole conduction bands are determined.
机译:分析了Ba(Fe_(0.9)Co_(0.1))_ 2As_2薄膜(T_c = 20 K)的光电导率和介电常数谱以及有关光发射和比热的文献数据。在高达T_c的所有温度下的超导状态下,在考虑了带内和带间配对相互作用的广义两带BCS模型中,磁场穿透深度的温度依赖性得到了很好的描述。结果表明,在电子子系统中产生了较小的超导能隙2Δ〜(1)= 3.7 meV,而在空穴子系统中形成了较大的间隙2Δ〜(2)= 7.9 meV。确定电子和空穴导带的正常状态参数,例如等离子体频率和散射率。

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  • 来源
    《Physical review》 |2011年第14期|p.140502.1-140502.4|共4页
  • 作者单位

    P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow 119991, Russia;

    Institute of High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow Region 142190, Russia;

    A.M. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow 119991, Russia, and Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region 141700, Russia;

    A.M. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow 119991, Russia, and Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region 141700, Russia;

    A.M. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow 119991, Russia, and Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region 141700, Russia;

    A.M. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow 119991, Russia, and Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region 141700, Russia;

    A.M. Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow 119991, Russia;

    Volgograd State Technical University, Lenin Avenue 28, Volgograd 400131, Russia;

    Physikalisches Institut, Universitat Stuttgart, Pfajfenwaldring 57, D-70550 Stuttgart, Germany;

    Physikalisches Institut, Universitat Stuttgart, Pfajfenwaldring 57, D-70550 Stuttgart, Germany;

    IFW Dresden, Institute for Metallic Materials, P.O. Box270116, D-01171 Dresden, Germany;

    IFW Dresden, Institute for Metallic Materials, P.O. Box270116, D-01171 Dresden, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    optical properties; BCS theory and its development; magnetic properties;

    机译:光学性能;BCS理论及其发展;磁性能;

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