Superconductivity of the filled skutterudite ThPt₄Ge ₁₂ investigated by muon spin rotation

The superconducting state of the filled skutterudite ThPt ₄Ge₁₂ has been investigated by the zero-field longitudinal and transverse-field muon spin rotation technique. The deduced temperature dependence of the muon spin depolarization rate, σ_s, at 0.04 T has been analyzed in terms of a phenomenological powerlaw behavior and a model appropriate for clean limit superconductors. The estimated effective Fermi temperature T_F = 87 K has been compared by means of the Uemura plot with those derived for other superconducting systems. The gap parameter δ(0)/k_B = 7.7(1) and the magnetic penetration depth λ = 156(5) nm, obtained from the muon data, confirm the specific heat results reported before.