Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12-xSbx
White, B. D.
Maple, M. Brian
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CitationJeon, I., Huang, K., Yazici, D., Kanchanavatee, N., White, B. D., Ho, P. C., ... & Maple, M. B. (2016). Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt 4 Ge 12− x Sb x. Physical Review B, 93(10), 104507.
We report a study of the superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12-xSbx. Polycrystalline samples with Sb concentrations up to x = 5 were synthesized and investigated by means of x-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements. We observed a suppression of superconductivity with increasing Sb substitution up to x = 4, above which no signature of superconductivity 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 electronic states in this system. The specific heat for x = 0.5 exhibits an exponential temperature dependence in the superconducting state, reminiscent of a nodeless superconducting energy gap. We observed evidence for a weak "rattling" mode associated with the Pr ions, characterized by an Einstein temperature Theta(E) similar to 60 K for 0 <= x <= 5; however, the rattling mode may not play any role in suppressing superconductivity.