Conventional s-wave pairing in the presence of spin fluctuations in superconducting Mo3Sb7 from specific heat measurements
Résumé
The superconducting properties of the spin fluctuation-superconductor Mo3Sb7 have been investigated by specific heat measurements down to 0.5 K and under magnetic fields of up to 2 T. The obtained temperature and magnetic field dependences of the electronic specific heat strongly suggest a conventional s-wave pairing, while possible (s+g)-pairing symmetry has been proposed earlier. In addition, the temperature dependence of the upper critical field Hc2 is fully consistent with the Werthamer–Helfand–Hohenberg theory predicting its behavior for a conventional phonon-mediated type II superconductor.
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