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Physical properties of the noncentrosymmetric superconductor Nb_(0.18)Re_(0.82)

机译:非中心对称超导体Nb_(0.18)Re_(0.82)的物理性质

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摘要

We report the synthesis and measurements of magnetic, transport, and thermal properties of polycrystalline Nb_(0.18)Re_(0.82). which has a superconducting transition at T_c ~ 8.8 K. The noncentrosymmetric a-Mn structure of the compound is confirmed by x-ray diffraction. Using the measured values for the lower critical field H_(c1), upper critical field H_(c2), and the specific heat C, we estimate the thermodynamic critical field H_c(0), coherence length ξ(0), penetration depth λ.(0), and the Ginzburg-Landau parameter κ(0). The specific heat jump at T_c, △C/γT_c = 1.86, suggests that Nb_(0.18)Re_(0.82) a moderately coupled superconductor. Below T_c the electronic specific heat decays exponentially, suggesting that the gap is isotropic. Our data suggest that the triplet admixture is weak in the polycrystalline form of compound. However, the estimated value of the upper critical field //_(c2)(0) is close to the calculated Pauli limit.
机译:我们报告了多晶Nb_(0.18)Re_(0.82)的磁性,传输和热性能的合成和测量。其在T_c〜8.8 K处具有超导转变。通过X射线衍射证实了该化合物的非中心对称α-Mn结构。使用下临界场H_(c1),上临界场H_(c2)和比热C的测量值,我们估算出热力学临界场H_c(0),相干长度ξ(0),穿透深度λ。 (0),以及Ginzburg-Landau参数κ(0)。 T_c处的比热跃迁,△C /γT_c= 1.86,表明Nb_(0.18)Re_(0.82)是中等耦合的超导体。在T_c以下,电子比热呈指数衰减,表明该间隙是各向同性的。我们的数据表明三重态混合物在化合物的多晶形式中较弱。但是,上限临界字段// __(c2)(0)的估计值接近计算的Pauli极限。

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  • 来源
    《Physical review》 |2011年第14期|p.144525.1-144525.6|共6页
  • 作者单位

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

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  • 正文语种 eng
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  • 关键词

    metals; alloys and binary compounds (including A15, MgB2, etc.);

    机译:金属;合金和二元化合物(包括A15;MgB2等);

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