Strongly correlated electron behavior in ROs4Sb12 (R=Ce, Pr) filled skutterudites

Abstract The physical properties of single crystals of the filled skutterudites CeOs 4 Sb 12 and PrOs 4 Sb 12 have been investigated. Transport and thermodynamic measurements on CeOs 4 Sb 12 indicate that it is a small band-gap semiconductor with an energy gap of ∼10 K , whereas PrOs 4 Sb 12 is a superconductor with a T C of 1.85 K .