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We report a study of the superconducting and normal-state properties of thefilled-skutterudite system PrPt$_{4}$Ge$_{12-x}$Sb$_x$. Polycrystalline sampleswith Sb concentrations up to $x =$ 5 were synthesized and investigated by meansof x-ray diffraction, electrical resistivity, magnetic susceptibility, andspecific heat measurements. We observed a suppression of superconductivity withincreasing Sb substitution up to $x =$ 4, above which, no signature ofsuperconductivity was observed down to 140 mK. The Sommerfeld coefficient,$\gamma$, of superconducting specimens decreases with increasing $x$ up to $x=$ 3, suggesting that superconductivity may depend on the density of electronicstates in this system. The specific heat for $x =$ 0.5 exhibits an exponentialtemperature dependence in the superconducting state, reminiscent of a nodelesssuperconducting energy gap. We observed evidence for a weak "rattling" modeassociated with the Pr ions, characterized by an Einstein temperature$\Theta_{\mathrm{E}} \sim$ 60 K for 0 $\leq x \leq$ 5; however, the rattlingmode may not play any role in suppressing superconductivity.

Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt$_{4}$Ge$_{12-x}$Sb$_{x}$