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La$_3$Co$_4$Sn$_{13}$ and La$_3$Ru$_4$Sn$_{13}$ were categorized as BCSsuperconductors. In a plot of the critical field $H_{c2}$ vs $T$,La$_3$Ru$_4$Sn$_{13}$ displays a second superconducting phase at the highercritical temperature $T_c^{\star}$, characteristic of inhomogeneoussuperconductors, while La$_3$Co$_4$Sn$_{13}$ shows bulk superconductivity below$T_c$. We observe a decrease in critical temperatures with external pressureand magnetic field for both compounds with $\frac{dT_c^{\star}}{dP} >\frac{dT_c}{dP}$. The pressure dependences of $T_c$ are interpreted accordingto the McMillan theory and understood to be a consequence of latticestiffening. The investigation of the superconducting state ofLa$_3$Co$_x$Ru$_{4-x}$Sn$_{13}$ shows a $T_c^{\star}$ that is larger then $T_c$for $x<4$. This unique and unexpected observation is discussed as a result ofthe local disorder and/or the effect of chemical pressure when Ru atoms arepartially replaced by smaller Co atoms.

journal of alloys and compounds

Superconductivity in the presence of disorder in skutterudite-related  La$_3$Co$_4$Sn$_{13}$ and La$_3$Ru$_4$Sn$_{13}$ compounds; electrical  transport and magnetic studies