Probing the superconductivity of PrPt4Ge12 through Ce substitution
K. Huang, L. Shu, I. K. Lum, B. D. White, M. Janoschek, D. Yazici, J. J. Hamlin, D. A. Zocco, P.-C. Ho, R. E. Baumbach, M. B. Maple
DOI 10.1103/PhysRevB.89.035145 · Physical Review B
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Abstract
We report measurements of electrical resistivity, magnetic susceptibility, specific heat, and thermoelectric power on the system Pr1−xCexPt4Ge12. Superconductivity is suppressed with increasing Ce concentration up to x=0.5, above which there is no evidence for superconductivity down to 1.1 K. The Sommerfeld coefficient γ increases with increasing x from ∼48 mJ/mol K2 up to ∼120 mJ/mol K2 at x= 0.5, indicating an increase in strength of electronic correlations. The temperature dependence of the specific heat at low temperatures evolves from roughly T3 for x= 0 to e−Δ/T behavior for x= 0.05 and above, suggesting a crossover from a nodal to a nodeless superconducting energy gap or a transition from multiband to single-band superconductivity. Fermi-liquid behavior is observed throughout the series in low-temperature magnetization, specific heat, and electrical resistivity measurements.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PrPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.9 | Pressure not reported | unknown |
| Pr1-xCexPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.9 | Pressure not reported | midpoint |
| PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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