$S$-wave pairing symmetry in non-centrosymmetric superconductor Re$_3$W

Details $S$-wave pairing symmetry in non-centrosymmetric superconductor Re$_3$W $S$-wave pairing symmetry in non-centrosymmetric superconductor Re$_3$W

2008-01-12

arxiv.org/abs/0801.1879v1

Physics

Condensed Matter

Superconductivity

12 pages, 5 figures

Scientific paper

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. \textbf{8}, 265 (1959)] with $T_\mathrm{c}=9 $K were prepared by arc melting. The ac susceptibility and low-temperature specific heat were measured on these alloys. It is found that there are two superconducting phases coexisting in the samples with $T_\mathrm{c1}\sim9 $K and $T_\mathrm{c2}\sim7 $K, both of which have a non-centrosymmetric structure as reported previously. By analyzing the specific heat data measured in various magnetic fields, we found that the absence of the inversion symmetry does not lead to the deviation from a s-wave pairing symmetry in Re$_3$W.

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