We report measurements of the temperature dependence of the magnetic penetration depth ͑T͒ in noncentrosymmetric superconductor Re 3 W. We employed two experimental techniques: extraction of ͑T͒ from magnetic dc susceptibility, measured on a powder sample, and the rf tunnel diode resonator technique, where a bulk polycrystalline sample was used. The results of both techniques agree: the temperature dependence of the penetration depth can be well described by weak-coupling, dirty-limit, s-wave BCS theory where we obtain ⌬͑0͒ / k B T C = 1.76± 0.05. No evidence for unconventional pairing resulting from the absence of the inversion symmetry is found.

PACS. 74.20.-z -Theories and models of superconducting state. PACS. 74.20.Rp -Pairing symmetries (other than s-wave). PACS. 74.25.Dw -Superconductivity phase diagrams.Abstract. -We use the microscopic weak coupling theory to predict the pairing state in superconductors of cubic, hexagonal, or tetragonal symmetry, where the order parameter is multicomponent, i.e., transforms according to either a 2-dimensional or a 3-dimensional representation of the crystal point group. We show that the superconducting phase usually breaks the time-reversal symmetry for singlet multicomponent superconductors. The superconducting order parameter for triplet superconductors in most cases turns out to be non-magnetic.c EDP Sciences

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