Abstract
In order to elucidate the variety of correlated electron phenomena found in filled skutterudite compounds, experiments were performed on single crystals of ternary Ce- and Pr-based filled skutterudite arsenides LnT 4 As 12 (Ln = Ce, Pr; T = Fe, Ru, Os) and pseudoternary Pr-based skutterudite antimonides Pr(Os 1- x Ru x ) 4 Sb 12 and Pr 1- x Nd x Os 4 Sb 12 . For example, the intermediate valence compound CeRu 4 As 12 exhibits non-Fermi liquid characteristics, while the compounds PrT 4 As 12 display ferromagnetic order (18 K) for T = Fe, BCS superconductivity (2.4 K) for T = Ru, unknown order (2.3 K) and antiferromagnetic order (2.2 K) for T = Os. PrOs 4 As 12 appears to be a Kondo lattice system with a small Kondo temperature (∼ 1 K) and an electronic specific heat coefficient γ∼1 J/mol K 2 . The T – x phase diagrams of Pr(Os 1- x Ru x ) 4 Sb 12 and Pr 1- x Nd x Os 4 Sb 12 reveal regions of superconductivity with different order parameter symmetry and magnetic order.
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