Multiband superconductivity in PrPt4Ge12 single crystals

Abstract

We report measurements of the London penetration depth $\Delta \lambda (T)$ and the electronic specific heat $C_e(T)$ on high-quality single crystals of the filled-skutterudite superconductor PrPt${}_4$Ge${}_{12}$ ($T_c\simeq$8K). Both quantities show a weak temperature dependence at $T\ll T_c$, following $\Delta \lambda \sim T^n$ ($n\simeq 3.2$) and $C_e/T\sim T^{2.8}$. Such temperature dependences deviate from both conventional s-wave type and nodal superconductivity. A detailed analysis indicates that the superfluid density ${\rho }_s(T)$, derived from the penetration depth, as well as the electronic specific heat can be consistently described in terms of a two-gap model, providing strong evidence of multiband superconductivity for PrPt${}_4$Ge${}_{12}$.

5 pages, 4 figures

References in corpus (16)

• Magnetic Penetration Depth in Unconventional Superconductors
• Phenomenological two-gap model for the specific heat of MgB_2
• Time-Reversal Symmetry-Breaking Superconductivity in Heavy Fermion PrOs4Sb12 detected by Muon Spin Relaxation
• Multiple Superconducting Phases in New Heavy Fermion Superconductor PrOs4Sb12
• Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2
• 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
• Superconductivity in novel Ge-based skutterudites: {Sr,Ba}Pt_4Ge_{12}
• Superconducting PrOs4Sb12: a thermal conductivity study
• Superfluid Density and Energy Gap-Function of Superconducting PrPt4Ge12
• Superconducting states in the tetrahedral compound PrOs4Sb12
• Superconducting properties of Pr-based Filled skutterudite PrRu${}_4$As${}_{12}$
• Penetration depth, multiband superconductivity, and absence of muon-induced perturbation in superconducting PrOs${}_4$Sb${}_{12}$
• Penetration depth study of LaOs${}_4$Sb${}_{12}$: Multiband s-wave superconductivity

Cited by in corpus (17)

• Recent progress on superconductors with time-reversal symmetry breaking
• Weak Interband-Coupling Superconductivity in the Filled Skutterudite LaPt4Ge12
• Three-Dimensional Majorana Fermions in Chiral Superconductors
• Anisotropic superconductivity in the noncentrosymmetric BiPd
• Evidence of multiband superconductivity in the $\beta$-phase Mo${}_{1-x}$Re${}_x$ alloys
• Schottky anomaly and short-range antiferromagnetic correlations in filled skutterudites Pr${}_{1-x}$Eu${}_x$Pt${}_4$Ge${}_{12}$
• Probing the superconductivity of PrPt4Ge12 through Ce substitution
• Broken Time Reversal Symmetry in Superconducting Pr1-xCexPt4Ge12
• Broken time-reversal symmetry in superconducting Pr${}_{1-x}$La${}_x$Pt${}_4$Ge${}_{12}$
• Antiferromagnetic Kondo lattice compound CePt${}_3$P
• Superconducting gap structure of the skutterudite LaPt4Ge12 probed by specific heat and thermal transport
• Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt${}_4$Ge${}_{12-x}$Sb${}_x$
• 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
• Broken time-reversal symmetry in cubic skutterudite-like superconductor Y${}_3$Ru${}_4$Ge${}_{13}$
• Superconductivity in the layered cage compound Ba3Rh4Ge16
• Superconducting Gap Structure of Filled Skutterudite LaOs${}_4$As${}_{12}$ Compound through $\mu$SR Investigations