Non-Fermi liquid behavior in a fluctuating valence system, the filled skutterudite compound CeRu_{4}As_{12}

Electrical resistivity ρ, specific heat C, and magnetic susceptibility χ measurements made on the filled skutterudite CeRu4As12 reveal non-Fermi liquid (NFL) T dependences at low T, i.e., ρ(T) ∼ T and weak power law or logarithmic divergences in C(T)/T and χ(T). Measurements also show that the T dependence of the thermoelectric power S(T) deviates from that seen in other Ce systems. The NFL behavior appears to be associated with fluctuations of the Ce valence between 3 and 4 rather than a typical Kondo lattice scenario that would be appropriate for an integral Ce valence of 3. PACS numbers: 71.10.Hf, 71.28.+d