Abstract
In filled skutterudites, which have attracted much attention as candidate materials for thermoelectric applications, rare Pr-based heavy-fermion (HF) behaviors have been revealed recently. We review recent studies focusing on PrFe 4P 12 and PrOs 4Sb 12; the former shows HF behaviors in high-fields where a quadruple ordering is suppressed, and the latter shows the first known Pr-based HF superconductivity as well as an anomalous field-induced quadruple ordering. We suggest that quadrupole degrees of freedom on the Pr-ions commonly play key roles in these exotic states.
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