Abstract
Recent experiments on the Pr-based filled skutterudite arsenides and antimonides PrOs 4 Sb 12 , Pr ( Os 1 - x Ru x ) 4 Sb 12 , Pr 1 - x Nd x Os 4 Sb 12 , PrFe 4 As 12 , PrRu 4 As 12 , and PrOs 4 As 12 are reviewed. The heavy fermion compound PrOs 4 Sb 12 exhibits unconventional strong-coupling superconductivity below T c = 1.85 K that breaks time reversal symmetry, apparently consists of several distinct superconducting phases, and may involve triplet spin pairing of electrons. Studies of the alloy systems Pr ( Os 1 - x Ru x ) 4 Sb 12 and Pr 1 - x Nd x Os 4 Sb 12 revealed rich T– x phase diagrams and a strong suppression of the high field ordered phase and the unconventional superconductivity of PrOs 4 Sb 12 with Ru substitution. Among the three Pr-based filled skutterudite arsenides, PrFe 4 As 12 has a ferromagnetic ground state, PrRu 4 As 12 exhibits conventional BCS superconductivity, and PrOs 4 As 12 is an antiferromagnet.
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