Superfluid Density and Energy Gap-Function of Superconducting PrPt4Ge12

Abstract

The filled skutterudite superconductor PrPt4Ge12 was studied in muon-spin rotation (muSR), specific heat, and electrical resistivity experiments. The continuous increase of the superfluid density with decreasing temperature and the dependence of the magnetic penetration depth λon the magnetic field obtained by means of muSR, as well as the observation of a T^3 dependence of the electronic specific heat establish the presence of point-like nodes in the superconducting energy gap. The energy gap was found to be well described by Δ=Δ_0| k_x - ik_y| or Δ= Δ_0(1 - k_y^4) functional forms, similar to that obtained for another skutterudite superconductor, PrOs4Sb12. The gap to T_c ratios were estimated to be Δ_0/k_BT_c = 2.68(5) and 2.29(5), respectively.

4 pages, 5 figures

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• Comparison of different methods for analyzing $\mu$SR line shapes in the vortex state of type-II superconductors
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Cited by in corpus (23)

• Unconventional Superconductivity
• Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12
• 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
• Multiband superconductivity in PrPt4Ge12 single crystals
• Multiple-gap response of type-I noncentrosymmetric BeAu superconductor
• 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${}_{12}$
• Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt${}_4$Ge${}_{12-x}$Sb${}_x$
• Nodeless superconductivity in Lu${}_{5-x}$Rh${}_6$Sn${}_{18+x}$ with broken time reversal symmetry
• Spontaneous magnetization in unitary superconductors with time reversal symmetry breaking
• Multiband superconductivity in the correlated electron filled skutterudite system Pr(1-x)Ce(x)Pt4Ge12
• Muon spin rotation study of the magnetic penetration depth in the intercalated graphite superconductor CaC6
• Magnetic order in the filled skutterudites RPt4Ge12 (R = Nd, Eu)
• Nonadiabatic effects of rattling phonons and 4f excitations in Pr(Os{1-x}Ru{x})4Sb12
• First Principles Study of Electronic Structure and Fermi Surface in Rare-earth Filled Skutterudites RPt4Ge12
• Superconducting parameters of BaPt(4-x)Au(x)Ge12 filled skutterudite
• Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr${}_{1-x}$Eu${}_x$Pt${}_4$Ge${}_{12}$
• Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr${}_2$B${}_2$