Probing the superconductivity of PrPt4Ge12 through Ce substitution

Article

关键词: NORMAL-STATE PROPERTIES;    PHASE;    PR;   

DOI  :  10.1103/PhysRevB.89.035145

来源: SCIE

【 摘 要 】

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 gamma increases with increasing x from similar to 48 mJ/mol K-2 up to similar to 120 mJ/mol K-2 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 T-3 for x = 0 to e(-Delta)/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.

【 授权许可】

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