Superconductivity in the ternary compound SrPt${}_{10}$P${}_4$ with complex new structure

We report superconductivity at 1.4K in the ternary SrPt${}_{10}$P${}_4$ with a complex new structure. SrPt${}_{10}$P${}_4$ crystallizes in a monoclinic space-group C2/c (#15) with lattice parameters a= 22.9151(9)$\mathring{A}$, b= 13.1664(5)$\mathring{A}$, c=13.4131(5)$\mathring{A}$, and $\beta$= 90.0270(5)${}^{\circ }$. Bulk superconductivity in the samples has been demonstrated through resistivity, ac susceptibility, and heat capacity measurements. High pressure measurements have shown that the superconducting T${}_C$ is systematically suppressed upon application of pressure, with a dT${}_C$/dP coefficient of -0.016 K/GPa.