Abstract
We present an investigation of the magnetic, thermodynamic, and electric transport properties and the electronic structure of the strongly correlated compounds Ce${}_{3}$Rh${}_{4}$Sn${}_{13}$ and Ce${}_{3}$Co${}_{4}$Sn${}_{13}$. The main goal of this report is to compare the physical properties of both compounds and to explain the abnormal electrical resistivity behavior in Ce${}_{3}$Co${}_{4}$Sn${}_{13}$ above $\ensuremath{\sim}160$ K, which has not been observed in Ce${}_{3}$Rh${}_{4}$Sn${}_{13}$. We suggest that a possible local distortion of the trigonal Sn2 prisms around Co occurs in Ce${}_{3}$Co${}_{4}$Sn${}_{13}$ below $\ensuremath{\sim}160$ K, which could change the electronic structure near the Fermi level and, as a consequence, explain the metallic behavior visible in the resistivity above this temperature. We determined experimentally the hybridization energy $\ensuremath{\Delta}$ between the $f$-electron and conduction-electron states for both compounds and its influence on the different $\ensuremath{\rho}(T)$ behaviors under pressure. The complimentary experimental data allowed us to explain the semimetallic properties of both compounds and the transition between semimetallic and metallic behavior in Ce${}_{3}$Co${}_{4}$Sn${}_{13}$, which is not observed for Ce${}_{3}$Rh${}_{4}$Sn${}_{13}$.
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