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Superfluid Density and Energy Gap Function of Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>PrPt</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:math>
The filled skutterudite superconductor ${\mathrm{PrPt}}_{4}{\mathrm{Ge}}_{12}$ was studied in muon-spin rotation ($\ensuremath{\mu}\mathrm{SR}$), specific heat, and electrical resistivity experiments. The continuous increase of the superfluid density with decreasing temperature and the dependence of the magnetic penetration depth $\ensuremath{\lambda}$ on the magnetic field obtained by means of $\ensuremath{\mu}\mathrm{SR}$, as well as the observation …