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Dynamical conductivity spectra s(w) have been measured for a diverse range ofheavy-fermion (HF) Ce and Yb compounds. A characteristic excitation peak hasbeen observed in the mid-infrared region of s(w) for all the compounds, and hasbeen analyzed in terms of a simple model based on conduction (c)-f electronhybridized band. A universal scaling is found between the observed peakenergies and the estimated c-f hybridization strengths of these HF compounds.This scaling demonstrates that the model of c-f hybridized band can generallyand quantitatively describe the charge excitation spectra of a wide range of HFcompounds.Comment: 5 pages, 1 table, 3 figures, to appear in J. Phys. Soc. Jpn. 76  (2007

Universal Scaling in the Dynamical Conductivity of Heavy Fermion Ce and Yb Compounds