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We report an investigation of the superconducting states of$\mathrm{Lu}_3\mathrm{Os}_4\mathrm{Ge}_{13}$ and$\mathrm{Y}_3\mathrm{Ru}_4\mathrm{Ge}_{13}$ single crystals by measurements ofthe electrical resistivity, ac susceptibility and London penetration depth. Theanalysis of the penetration depth and the derived superfluid density indicatesthe presence of nodeless superconductivity and suggest that there are multiplesuperconducting gaps in both materials. Furthermore, ac susceptibilitymeasurements of both compounds display the peak effect in the low temperatureregion of the $H-T$ phase diagram. This anomalous increase of the criticalcurrent with field gives an indication of a change of the arrangement of fluxlines in the mixed state, as found in some of the isostructural stannidematerials.

physical review. b./physical review. b

Nodeless superconductivity and the peak effect in the  quasi-skutterudites $\mathrm{Lu}_3\mathrm{Os}_4\mathrm{Ge}_{13}$ and  $\mathrm{Y}_3\mathrm{Ru}_4\mathrm{Ge}_{13}$