We report measurements of the temperature dependence of the magnetic penetration depth \lambda(T) in non-centrosymmetric superconductor Re_3W. We employed two experimental techniques: extraction of \lambda(T) from magnetic {\em 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 Δ(0)/kBTC=1.76. No evidence for unconventional pairing resulting from the absence of the inversion symmetry is found.
@article{arxiv.0707.1905,
title = {s-Wave superconductivity in non-centrosymmetric Re_3W probed by magnetic penetration depth},
author = {Y. L. Zuev and V. A. Kuznetsova and R. Prozorov and M. D. Vannette and M. V. Lobanov and D. K. Christen and J. R. Thompson},
journal= {arXiv preprint arXiv:0707.1905},
year = {2007}
}