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 λ on the magnetic field obtained by means of muSR, as well as the observation of a T3 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 =0| kx - iky| or = 0(1 - ky4) functional forms, similar to that obtained for another skutterudite superconductor, PrOs4Sb12. The gap to Tc ratios were estimated to be 0/kBTc = 2.68(5) and 2.29(5), respectively.
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