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)†
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
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.
Received: 17 October 2008
Revised: 30 October 2008
Accepted manuscript online:
Fund: 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).
Cite this article:
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) Specific heat of the non-centrosymmetric superconductor Re3W 2009 Chin. Phys. B 18 704
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