Superconductivity at 3.7 K in Ternary Silicide Li2IrSi3
  We report the discovery of superconductivity at Tc = 3.7 K in the new ternary lithium silicide Li2IrSi3. The crystal structure of Li2IrSi3 consists of IrSi6 antiprisms connected by Si triangles, giving rise to a three dimensional framework of covalent Si-Si and Si-Ir bonds. Electronic specific-heat in superconducting phase suggests that Li2IrSi3 is a BCS weak-coupling superconductor. 
Daigorou Hirai, Rui Kawakami, Oxana V. Magdysyuk, Robert E. Dinnebier,   Alexander Yaresko, and Hidenori Takagi
cond-mat.supr-con cond-mat.mtrl-sci cond-mat.str-el