Abstract
Abstract Lattice parameters, electrical resistivity, Hall constant, magnetic susceptibility and specific heat measurements have been made on R 3 Au 3 Sb 4 ( R = La, Ce, Pr) and R 3 Pt 3 Sb 4 (R = Ce, Pr). It is found that La 3 Au 3 Sb 4 and Ce 3 Au 3 Sb 4 show semi-metallic or semiconducting behaviors, while Pr 3 Pt 3 Sb 4 shows metallic one. Furthermore, it is revealed that the value of the valence of Ce ions in Ce 3 Au 3 Sb 4 is well-defined 3+. These results indicate that R 3 3+ Au 3 Sb 4 and R 3 3+ Pt 3 Sb 4 are narrow-gap semiconductors and metals, respectively, in agreement with our band calculation on La 3 Au 3 Sb 4 . As for the Ce 3 Pt 3 Sb 4 , it also shows semiconducting property and the Ce ions is in a mixed valence state, similar to that in CeO 2 .
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