Jeon, InhoHuang, KevinYazıcı, DuyguKanchanavatee, NoraveeWhite, B. D.Ho, Pei-ChunJang, SooyoungPouse, NaveenMaple, M. Brian2021-09-102021-09-102016Jeon, 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.https://hdl.handle.net/11494/3414This work was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Grant No. DE-FG02-04-ER46105 (characterization and physical properties measurements), and the National Science Foundation under Grant No. DMR 1206553 (low-temperature measurements). Helpful discussions with S. Ran are gratefully acknowledged.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.eninfo:eu-repo/semantics/openAccessArticle931010.1103/PhysRevB.93.104507Q1N/A