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Hartig, L.J. de Jongh","submitted_at":"2006-05-19T12:45:06Z","abstract_excerpt":"We report Muon Spin Relaxation studies in weak transverse fields of the superconductivity in the metal cluster compound, Ga$\\_{84}$[N(SiMe$\\_{3}$)$\\_{2}$]$\\_{20}$-Li$\\_{6}$Br$\\_{2}$(thf)$\\_{20}\\cdot $2toluene. The temperature and field dependence of the muon spin relaxation rate and Knight shift clearly evidence type II bulk superconductivity below $T\\_{\\text{c}}\\approx7.8$ K, with $B\\_{\\text{c1}}\\approx 0.06$ T, $B\\_{\\text{c2}}\\approx 0.26 $ T, $\\kappa\\sim 2$ and weak flux pinning. The data are well described by the s-wave BCS model with weak electron-phonon coupling in the clean limit. 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