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

W J Ban, J L Luo, N L Wang

We report resistivity, specific heat and optical spectroscopy measurements on single crystal samples of La${}_3$Co${}_4$Sn${}_{13}$ and Ce${}_3$Co${}_4$Sn${}_{13}$. We observed clear temperatu…