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Mixed bulk-filament nature in superconductivity of the charge-density-wave conductor ZrTe_3

机译：电荷密度波导体ZrTe_3超导的混合体丝特性

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摘要

We have shown that the superconducting transitions in ZrTe_3 are successive from filamentary to bulk, based on experimental results obtained for a superconducting specific-heat anomaly and the anisotropic superconducting transition curve of resistivity. A small jumplike superconducting specific-heat anomaly with a large and widely extended tail was observed to closely follow the anisotropic zero-resistance transition. We concluded that the jumplike anomaly signifies the onset of the long-range order of Cooper pairs with the opening of a superconducting gap at T_C, while the large and widely extended tail indicates behavior induced by Cooper pairs with a very short coherence length. As a limit for a very short coherence length, we propose local pairs with Bose characteristics. As a result, we can understand that the filamentary superconductivity is caused by the local pairs, and the large and widely extended tail is in a crossover region between superconductivity induced by local pairs and that induced by Cooper pairs. Based on a discussion about the origin of the change in the pair coupling from the starting of local pairing to Cooper pairing in ZrTe_3, we conclude that "mixed bulk-filament superconductivity" results from unique electronic structural changes in the quasi-1D + 3D (D, dimensional) Fermi surfaces after the CDW transition.
机译：基于超导比热异常和电阻率各向异性超导转变曲线的实验结果，我们表明ZrTe_3中的超导转变从丝状到块状是连续的。观察到一个小的跳跃状超导比热异常，其尾巴较大且延伸较宽，紧密跟随各向异性零电阻跃迁。我们得出的结论是，类似跳跃的异常现象表明，在T_C处超导缝隙的开放会导致Cooper对的长距离顺序的开始，而大而宽的尾巴则表明相干长度非常短的Cooper对所引起的行为。为了限制非常短的相干长度，我们提出了具有Bose特征的局部对。结果，我们可以理解，丝状超导性是由局部对引起的，并且大而宽的尾巴位于局部对引起的超导和库珀对引起的超导之间的交叉区域。基于对ZrTe_3中从局部配对开始到Cooper配对的配对耦合变化的起源的讨论，我们得出结论，“混合体丝超导”是由准1D + 3D的独特电子结构变化引起的（ D，尺寸）CDW过渡后的费米表面。

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  • 来源
    《Physical review》 |2012年第18期|p.184513.1-184513.6|共6页
  • 作者

    Kazuhiko Yamaya; Shigeru Takayanagi; Satoshi Tanda;

  • 作者单位

    Center of Education and Research for Topological Science and Technology, Hokkaido University, Kita 13, Nishi 8 Kita-Ku, Sapporo 060-8628, Japan;

    Center of Education and Research for Topological Science and Technology, Hokkaido University, Kita 13, Nishi 8 Kita-Ku, Sapporo 060-8628, Japan;

    Center of Education and Research for Topological Science and Technology, Hokkaido University, Kita 13, Nishi 8 Kita-Ku, Sapporo 060-8628, Japan,Department of Applied Physics, Hokkaido University, Kita 13, Nishi 8 Kita-Ku, 060-8628 Sapporo, Japan;

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  • 正文语种 eng
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  • 关键词

    thermodynamic properties; charge-density-wave systems; metals; alloys and binary compounds (including A15, MgB2, etc.);

    机译：热力学性质;电荷密度波系统;金属;合金和二元化合物（包括A15;MgB2等）;

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