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We report resistivity, specific heat and optical spectroscopy measurements onsingle crystal samples of La$_3$Co$_4$Sn$_{13}$ and Ce$_3$Co$_4$Sn$_{13}$. Weobserved clear temperature-induced spectral weight suppression below 4000 \cmfor both compounds in conductivity spectra $\sigma_1(\omega)$, indicating theprogressive formation of gap-like features with decreasing temperature. Thesuppressed spectral weight transfers mostly to the higher energy region. Theobservation reflects the presence of correlation effect in the compounds. Weattribute the correlation effect to the Co 3d electrons.

Revealing correlation effect of Co 3d electrons in La$_3$Co$_4$Sn$_{13}$ and Ce$_3$Co$_4$Sn$_{13}$ by infrared spectroscopy study