Abstract
We report the synthesis and superconductivity of a new Ru-based alloy Ru3Sb1.75Sn5.25. The single crystal and polycrystal samples were synthesized by the Sn-flux method and solid state reaction, respectively. The Ru3Sb1.75Sn5.25 crystals were characterized by powder X-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements. We find Ru3Sb1.75Sn5.25 crystallize in the Ir3Ge7-type structure and exhibits superconductivity with onset transition temperature Tc = 4.2 K. Density functional theory calculation on Ru3Sb1.75Sn5.25 unveils multiple peaks of density of states around the Fermi level, which may explain the emergence of superconductivity. Our study provides an example compound to explore the fascinating interplay of superconductivity, electronic band structure and paramagnetism in Ru-based superconductors.
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