Specific Heat Study on Heavy-Fermion Pr compounds with filled   skutterudite structure
  Rare 4f^2-based heavy-fermion behaviors have been revealed recently in Pr-based filled skutterudites PrFe4P12 and PrOs4Sb12. Recent studies on the thermal properties on both compounds are reported, putting emphasis on the field-induced ordered phase found in PrOs4Sb12. 
Y. Aoki, T. Namiki, T. Kanayama, S. Ohsaki, S. R. Saha, H. Sugawara,   H. Sato (Tokyo Metropolitan University)