Abstract
The low-temperature magnetic susceptibilities and electrical resistivities of a new family of ternary suicides of general formula RMSi 3 are described. These compounds, where R ≡ La or Ce and M ≡ Co, Rh, Ir, or Ru and Os crystallize in the BaNiSn 3 structure. LaRhSi 3 and LaIrSi 3 are found to be superconducting with T c ∼- 2.5 K. In CeRhSi 3 and CeIrSi 3, the Ce valence is close to 3 and these compounds are Kondo-lattice systems. An anomaly occurs in their susceptibilities at ∼-2 K and 5 K, respectively, accompanied by a sudden change from T to a T 2 regime in their resistivities. At the other end of the series, CeCoSi 3 behaves like a normal metal and becomes superconducting below T c ∼- 1.2 –1.4 K.
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