Hybridization gap-open in CeIn3

Abstract

Reflectivity spectra of CeIn3 are measured at 7, 30, 50, 100, 150, 200 and 300K in wild energy regions from 6meV to 30eV. Optical conductivity spectra are obtained from a Kramers–Kronig’ relation. A hump in the optical conductivity σ1 is observed at about 500cm−1 below 100K, resulting from strong hybridization between conduction electrons and Ce 4f electronic states. The low frequency plasmon indicating the existence of heavy particles is also observed below coherence temperature T∗∼100K.