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

Shin-ichi Kimura, Yong Seung Kwon, Yuji Matsumoto +2

Cerium (Ce)-based heavy-fermion materials have a characteristic double-peak structure (mid-IR peak) in the optical conductivity [$\sigma (\omega )$] spectra originating from the strong conduct…