Universal scaling in the dynamical conductivity of heavy fermion Ce and Yb compounds

Abstract

Dynamical conductivity spectra s(w) have been measured for a diverse range of heavy-fermion (HF) Ce and Yb compounds. A characteristic excitation peak has been observed in the mid-infrared region of s(w) for all the compounds, and has been analyzed in terms of a simple model based on conduction (c)-f electron hybridized band. A universal scaling is found between the observed peak energies and the estimated c-f hybridization strengths of these HF compounds. This scaling demonstrates that the model of c-f hybridized band can generally and quantitatively describe the charge excitation spectra of a wide range of HF compounds.

5 pages, 1 table, 3 figures, to appear in J. Phys. Soc. Jpn. 76 (2007)

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• Slow crossover in YbXCu4 intermediate valence compounds
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• Pseudogap Formation and Heavy Carrier Dynamics in Intermediate Valence YbAl3
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