  Motivated by current research efforts towards exploring the interplay between
magnetism and superconductivity in multiband electronic systems, we have
investigated the effects of Eu substitution through thermodynamic measurements
on the superconducting filled skutterudite alloys
Pr$_{1-x}$Eu$_x$Pt$_4$Ge$_{12}$. An increase in Eu concentration leads to a
suppression of the superconducting transition temperature consistent with an
increase of magnetic entropy due to Eu local moments. While the low-temperature
heat capacity anomaly is present over the whole doping range, we find that in
alloys with $x\leq0.5$ the Schottky peaks in the heat capacity in the
superconducting state appear to be due to Zeeman splitting by an internal
magnetic field. Our theoretical modeling suggests that this field is a result
of the short-range antiferromagnetic correlations between the europium ions.
For the samples with $x > 0.5$, the peaks in the heat capacity signal the onset
of antiferromagnetic (AFM) ordering of the Eu moments.
