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

Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr$_{1-x}$Eu$_x$Pt$_4$Ge$_{12}$