Physical properties of Ce_3+xRu₄Sn_13-x (0 ≤ x ≤ 1) single crystals

The heavy fermion systems CeRuSn₃ and Ce₃Ru₄Sn₁₃ crystallize into the cubic LaRuSn₃- and Yb₃Rh₄Sn₁₃-type structure, respectively, having the same space group (Pm-3n, No. 223). Earlier studies on polycrystalline samples show that the electrical resistivity ρ(T) of Ce₃Ru₄Sn₁₃ follows a metallic behavior, whereas ρ(T) of CeRuSn₃ shows a semiconducting-like behavior. In this study, we have grown single crystals of Ce_3+xRu₄Sn_13-x (0 ≤ x ≤ 1) by Sn flux. Physical property measurements are performed in these single crystals on various samples with different growth conditions. Thermodynamic and transport properties of these single crystals highly depend on the initial loading compositions, showing either a typical Kondo lattice behavior or a semiconducting-like behavior. In this talk, we will present the crystal structure of grown single crystals and the relationship between LaRuSn₃- and Yb₃Rh₄Sn₁₃-type structure. In addition, we will discuss drastically different physical properties with respect to crystal structure types.