Anderson lattice in CeNiSi$_2$ intermediate valence compound

Details Anderson lattice in CeNiSi$_2$ intermediate valence compound Anderson lattice in CeNiSi$_2$ intermediate valence compound

2002-07-09

arxiv.org/abs/cond-mat/0207240v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, including 4 figures

Scientific paper

We present experimental results of electrical resistivity, Hall coefficient, magnetic susceptibility, and specific heat for single crystals of Ce-based intervalent compound CeNiSi$_2$. The results show similar behaviors observed in Yb-based intervalent compounds and support recent thoery of the Anderson lattice, in which the Fermi-liquid coherence is gloval over the whole lattice. There is a low-temperature scale $T_{coh} \sim$ 50 K for the onset of Fermi-liquid coherence, in addition to a high-temperature scale $T_K^* \sim$ 150 K for the Kondo-lattice condensation. Therefore, we conclude that two energy scales are generic in intermediate valence compounds based on Ce where the orbital degeneracy is smaller and where the size of the $4f$ orbital is larger than those based on Yb.

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