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首页> 外文期刊>Physical review. B, Condensed Matter And Materals Physics >Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt_4Ge_(12-x)Sb_x
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Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt_4Ge_(12-x)Sb_x

机译：填充方钴矿体系PrPt_4Ge_（12-x）Sb_x的超导和常态性质研究

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摘要

We report a study of the superconducting and normal-state properties of the filled-skutterudite system PrPt_4Ge_(12-x)Sb_x. Polycrystalline samples with Sb concentrations up to x = 5 were synthesized and investigated by means of x-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements. We observed a suppression of superconductivity with increasing Sb substitution up to x = 4, above which no signature of superconductivity was observed down to 140 mK. The Sommerfeld coefficient, γ, of superconducting specimens decreases with increasing x up to x = 3, suggesting that superconductivity may depend on the density of electronic states in this system. The specific heat for x = 0.5 exhibits an exponential temperature dependence in the superconducting state, reminiscent of a nodeless superconducting energy gap. We observed evidence for a weak "rattling" mode associated with the Pr ions, characterized by an Einstein temperature Θ_E～ 60 K for 0≤x≤5; however, the rattling mode may not play any role in suppressing superconductivity.
机译：我们报告了填充方钴矿系统PrPt_4Ge_（12-x）Sb_x的超导和常态特性的研究。合成了Sb浓度高达x = 5的多晶样品，并通过X射线衍射，电阻率，磁化率和比热测量进行了研究。我们观察到随着Sb的增加直至x = 4，超导性受到抑制，在此之上，直到140 mK都没有观察到超导性。超导样品的Sommerfeld系数γ随着x的增加而减小，直至x = 3，这表明超导性可能取决于该系统中电子态的密度。 x = 0.5的比热在超导状态下表现出指数温度依赖性，让人联想到无节点的超导能隙。我们观察到与the离子相关的弱“咔嗒”声模式的证据，其特征在于爱因斯坦温度Θ_E〜60 K（0≤x≤5）。但是，嘎嘎声模式在抑制超导方面可能没有任何作用。

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    《Physical review. B, Condensed Matter And Materals Physics》 |2016年第10期|104507.1-104507.10|共10页
  • 作者

    I. Jeon; K. Huang; D. Yazici; N. Kanchanavatee; B. D. White; P.-C. Ho; S. Jang; N. Pouse; M. B. Maple;

  • 作者单位

    Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, USA ,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA;

    Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, USA ,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA ,State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China;

    Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA ,Department of Physics, University of California, San Diego, La Jolla, California 92093, USA ,Faculty of Health Sciences, Artvin Coruh University, Artvin 08100, Turkey;

    Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA ,Department of Physics, University of California, San Diego, La Jolla, California 92093, USA ,Department of Physics, Faculty of Sciences, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand;

    Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA ,Department of Physics, University of California, San Diego, La Jolla, California 92093, USA ,Department of Physics, Central Washington University, 400 East University Way, Ellensburg, Washington 98926-7442, USA;

    Department of Physics, California State University, Fresno, California 93740, USA;

    Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, USA ,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA ,Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California 94720, USA;

    Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA ,Department of Physics, University of California, San Diego, La Jolla, California 92093, USA;

    Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, USA ,Center for Advanced Nanoscience, University of California, San Diego, La Jolla, California 92093, USA ,Department of Physics, University of California, San Diego, La Jolla, California 92093, USA;

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