Probing the superconductivity of PrPt4Ge12 through Ce substitution

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 K^2 up 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^(-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.

arXiv comment9 pages, 12 figures

References in corpus (23)

• Time-Reversal Symmetry-Breaking Superconductivity in Heavy Fermion PrOs4Sb12 detected by Muon Spin Relaxation
• Multiple Superconducting Phases in New Heavy Fermion Superconductor PrOs4Sb12
• Universality in heavy-fermion systems with general degeneracy
• Thermodynamical Study on the Heavy-Fermion Superconductor PrOs4Sb12: Evidence for Field-Induced Phase Transition
• Low temperature specific heat of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Ferromagnetic quantum critical fluctuations in YbRh_2(Si_{0.95}Ge_{0.05})_2
• Multiband superconductivity in the heavy fermion compound PrOs4Sb12
• Probing the superconducting gap symmetry of PrOs${}_4$Sb${}_{12}$: A penetration depth study
• Superconductivity in the New Platinum Germanides MPt4Ge12 (M = Rare-earth and Alkaline-earth Metals) with Filled Skutterudite Structure
• Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12
• muSR linewidth and isotropic pairing in superconducting PrOs4Sb12
• Theory of the thermoelectricity of intermetallic compounds with Ce or Yb ions
• Superconductivity in novel Ge-based skutterudites: {Sr,Ba}Pt_4Ge_{12}
• Superconducting PrOs4Sb12: a thermal conductivity study
• Superconducting phase diagram of the filled skuterrudite PrOs4Sb12
• Very Low Temperature Tunnelling Spectroscopy in the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Superconductivity and crystalline electric field effects in the filled skutterudite series Pr(Os${}_{1-x}$Ru${}_x$)${}_4$Sb${}_{12}$
• Superfluid Density and Energy Gap-Function of Superconducting PrPt4Ge12
• Superconducting properties of Pr-based Filled skutterudite PrRu${}_4$As${}_{12}$
• Multiband superconductivity in PrPt4Ge12 single crystals
• Superconductivity and the high field ordered phase in the heavy fermion compound PrOs${}_4$Sb${}_{12}$
• Charge-Doping driven Evolution of Magnetism and non-Fermi-Liquid Behavior in the Filled Skutterudite CePt4Ge12-xSbx
• Penetration depth, multiband superconductivity, and absence of muon-induced perturbation in superconducting PrOs${}_4$Sb${}_{12}$

Cited by in corpus (9)

• Three-Dimensional Majorana Fermions in Chiral Superconductors
• Broken Time Reversal Symmetry in Superconducting Pr1-xCexPt4Ge12
• Molecular Pairing and Fully-Gapped Superconductivity in Yb doped CeCoIn5
• Broken time-reversal symmetry in superconducting Pr${}_{1-x}$La${}_x$Pt${}_4$Ge${}_{12}$
• Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt${}_4$Ge${}_{12-x}$Sb${}_x$
• Superconducting gap structure of the skutterudite LaPt4Ge12 probed by specific heat and thermal transport
• Multiband superconductivity in the correlated electron filled skutterudite system Pr(1-x)Ce(x)Pt4Ge12
• First Principles Study of Electronic Structure and Fermi Surface in Rare-earth Filled Skutterudites RPt4Ge12
• Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr${}_{1-x}$Eu${}_x$Pt${}_4$Ge${}_{12}$