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The crystal structure, superconducting properties, and electronic structure of a novel superconducting 122-type antimonide, BaPt 2 Sb 2 , have been investigated by measurements of powder X-ray diffraction patterns, electrical resistivity, ac magnetic susceptibility, specific heat as well as ab-initio calculations. This material crystallizes in a new-type of monoclinic variant of the CaBe 2 Ge 2 -type structure, in which Pt 2 Sb 2 layers consisting of PtSb 4 tetrahedra and Sb 2 Pt 2 layers consisting of SbPt 4 tetrahedra are stacked alternatively and Ba atoms are located between the layers.Measurements of electrical resistivity, ac magnetic susceptibility and specific heat revealed that BaPt 2 Sb 2 is a superconducting material with a T C of 1.8 K. The electronic heat capacity coefficient γ n and Debye temperature θ D were 8.6(2) mJ/mol K 2 and 146(4) K, where the figures in parentheses represent the standard deviation. The upper critical field µ 0 H C2 (0) and the Ginzburg-Landau coherent length ξ(0) were determined to be 0.27 T and 35 nm. Calculations showed that it has two three-dimensional Fermi surfaces (FSs) and two two-dimensional FSs, leading to anisotropic transport properties. The d-states of the Pt atoms in the Pt 2 Sb 2 layers mainly contribute to N(E F ). A comparison between experimental and calculated results indicates that BaPt 2 Sb 2 is a superconducting material with moderate coupling.

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