Transport coefficients of intermediate valent CeNix intermetallic compounds

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Abstract

The resistivity and thermoelectric power of intermediate valent CeNix intermetallic compounds and their La homologs were determined in the temperature ranges 1.5 to 350 K and 1000 K, respectively. The results are discussed in the frame of a theory for the quasiparticle density of states of intermediate valent systems.

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    The broad peak feature observed here is characteristic of a Kondo lattice and it is similar to the observation in Pr3Ir4Ge13 [28,29] and several other strongly correlated Ce-, Yb- and U-based Kondo systems [30–34]. While such feature could also point towards temperature-driven instabilities in the charge carrier density at the Fermi level, occasioned by the intermediate valence state of the rare-earth moment [35], results from χ(T) does not support any valence fluctuation or intermediate valence state in the title compound. The inset of Fig. 7(b) is a plot of S(T)∕T below 50 K. S∕T attains a value of about −0.27 μV/K near 2 K which indicates the presence of little or no enhancement in S(T) at low temperatures.

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