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Cerium (Ce)-based heavy-fermion materials have a characteristic double-peakstructure (mid-IR peak) in the optical conductivity [$\sigma(\omega)$] spectraoriginating from the strong conduction ($c$)--$f$ electron hybridization. Toclarify the behavior of the mid-IR peak at a low $c$-$f$ hybridizationstrength, we compared the $\sigma(\omega)$ spectra of the isostructuralantiferromagnetic and heavy-fermion Ce compounds with the calculated unoccupieddensity of states and the spectra obtained from the impurity Anderson model.With decreasing $c$-$f$ hybridization intensity, the mid-IR peak shifts to thelow-energy side owing to the renormalization of the unoccupied $4f$ state, butsuddenly shifts to the high-energy side owing to the $f$-$f$ on-site Coulombinteraction at a slight localized side from the quantum critical point (QCP).This finding gives us information on the change in the electronic structureacross QCP.

Optical Evidence of Itinerant-Localized Crossover of $4f$ Electrons in Cerium Compounds