中国物理B ›› 2009, Vol. 18 ›› Issue (2): 704-708.doi: 10.1088/1674-1056/18/2/049

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Specific heat of the non-centrosymmetric superconductor Re3W

闫静, 单磊, 罗强, 汪卫华, 闻海虎   

  1. National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China
  • 收稿日期:2008-10-17 修回日期:2008-10-30 出版日期:2009-02-20 发布日期:2009-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China, the National Basic Research Program of China (Grant Nos 2006CB601000, 2006CB921802 and 2006CB921300), and the Knowledge Innovation Program of the Chinese Academy of Sciences (ITSNEM).

Specific heat of the non-centrosymmetric superconductor Re3W

Yan Jing(闫静), Shan Lei(单磊), Luo Qiang(罗强), Wang Wei-Hua(汪卫华), and Wen Hai-Hu(闻海虎)†   

  1. National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China
  • Received:2008-10-17 Revised:2008-10-30 Online:2009-02-20 Published:2009-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China, the National Basic Research Program of China (Grant Nos 2006CB601000, 2006CB921802 and 2006CB921300), and the Knowledge Innovation Program of the Chinese Academy of Sciences (ITSNEM).

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摘要： The alloys of non-centrosymmetric superconductor, Re3W, which were reported to have an α-Mn structure [P. Greenfield and P. A. Beck, J. Metals, N. Y. 8, 265 (1959)] with Tc=9K, are prepared by arc melting. The values of ac susceptibility and the low-temperature specific heat of these alloys are measured. It is found that there are two superconducting phases coexisting in the samples with Tc1≈9K and Tc2≈7K, which are both non-centrosymmetric in structure as reported previously. By analysing the specific heat data measured in various magnetic fields down to a temperature of 1.8K, we find that the absence of the inversion symmetry does not lead to an obvious deviation from an s$-wave pairing symmetry in Re3W.

关键词: Re3W, non-centrosymmetric, superconductivity, specific heat

Abstract: The alloys of non-centrosymmetric superconductor, Re$_3$W, which were reported to have an $\alpha$-Mn structure [P. Greenfield and P. A. Beck, J. Metals, N. Y. 8, 265 (1959)] with $T_{\rm c}=9$ K, are prepared by arc melting. The values of ac susceptibility and the low-temperature specific heat of these alloys are measured. It is found that there are two superconducting phases coexisting in the samples with $T_{\rm c1}\approx9$ K and $T_{\rm c2}\approx7$ K, which are both non-centrosymmetric in structure as reported previously. By analysing the specific heat data measured in various magnetic fields down to a temperature of 1.8 K, we find that the absence of the inversion symmetry does not lead to an obvious deviation from an $s$-wave pairing symmetry in Re$_3$W. 

Key words: Re3W, non-centrosymmetric, superconductivity, specific heat

中图分类号:  (Thermodynamic properties)

  • 74.25.Bt
74.70.Ad (Metals; alloys and binary compounds)