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The superconducting state of the filled skutterudite alloy seriesPr$_{1-x}$La$_{x}$Pt$_{4}$Ge$_{12}$ has been systematically studied by specificheat, zero-field muon spin relaxation ($\mu$SR), and superconducting criticalfield measurements. An additional inhomogeneous local magnetic field,indicative of broken time-reversal symmetry (TRS), is observed in thesuperconducting states of the alloys. For $x \lesssim 0.5$ the broken-TRS phasesets in below a temperature $T_m$ distinctly lower than the superconductingtransition temperature $T_c$. For $x \gtrsim 0.5$ $T_m \approx T_c$. The localfield strength decreases as $x \to 1$, where LaPt$_{4}$Ge$_{12}$ ischaracterized by conventional pairing. The lower critical field $H_{c1}(T)$ ofPrPt$_{4}$Ge$_{12}$ shows the onset of a second quadratic temperature regionbelow $T_q \sim T_m$. Upper critical field $H_{c2}(T)$ measurements suggestmultiband superconductivity, and point gap nodes are consistent with thespecific heat data. In Pr$_{1-x}$La$_{x}$Pt$_{4}$Ge$_{12}$ only a singlespecific heat discontinuity is observed at $T_c$, in contrast to the secondjump seen in PrOs$_{4}$Sb$_{12}$ below $T_c$. These results suggest thatsuperconductivity in PrPt$_{4}$Ge$_{12}$ is characterized by a complex orderparameter.

Broken time-reversal symmetry in superconducting Pr$_{1-x}$La$_{x}$Pt$_{4}$Ge$_{12}$