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The effect of La substitution and magnetic field on non-Fermi-liquid behaviour in CeRu4Sb12

CeRu4Sb12 with the filled skutterudite structure exhibits a novel non-Fermi-liquid (NFL) behaviour in the low-temperature specific heat and electrical resistivity at ambient pressure. We investigated the effect of La substitution and magnetic field on the NFL state and found that it can be easily destroyed either by the application of a magnetic field or by a small degree of La substitution. In magnetic fields, C/T becomes strongly depressed and nearly constant below 1 K and ρ(T) turns to following a T2-law, implying that the Fermi-liquid state recovers in high magnetic fields. The type of critical fluctuation is discussed on the basis of the results of magnetic susceptibility, electrical resistivity and specific heat measurements.