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

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Dynamical conductivity spectra [σ(ω)] have been measured for many heavy-fermion (HF) Ce and Yb compounds. A characteristic excitation peak has been observed in the infrared region of σ(ω) 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 low-energy charge excitations in a wide range of HF compounds.

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