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Superfluid Density and Energy Gap-Function of Superconducting PrPt4Ge12

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.

preprint2009arXivOpen access
A. MaisuradzeM. NicklasR. GumeniukC. BainesW. SchnelleH. RosnerA. Leithe-JasperYu. GrinR. Khasanov
cond-mat.supr-con
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A. MaisuradzeM. NicklasR. GumeniukC. BainesW. SchnelleH. RosnerA. Leithe-JasperYu. GrinR. Khasanov

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