Abstract
Metal phosphides with skutterudite (CoAs 3 )-type structure have been prepared using a wedgetype cubic-anvil high pressure apparatus. NiP 3 , LaRu 4 − x Os x P 12 ( x : 0, 1, 2, 3, 4) and CeRu 4 P 12 were synthesized at around 1100 °C and 4 GPa. The electrical conductivity and superconductivity of these metal phosphides were studied at low temperatures. The resistivity of NiP 3 was 1.6 × 10 −3 Ω cm at room temperature and decreased with decreasing temperature. A magnetic susceptibility of the phosphide showed Pauli paramagnetism. NiP 3 behaves as a metal. The resistivity of CeRu 4 P 12 increased with decreasing temperature. The semiconductive behavior was observed for this phosphide. The superconductivity of LaRu 4 P 12 , LaRu 3 OsP 12 and LaRu 2 Os 2 P 12 was observed at around 7 K. The magnetic field dependence of the T c was studied for LaRu 4 P 12 . The upper critical field ( H c 2 ) of LaRu 4 P 12 was 3.65 tesla at 0 K. The superconductivity of LaOs 4 P 12 was not found above 2 K. The electronic states and the superconductivity of the metal phosphides with skutterudite-type structure are discussed.
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