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.Comment: 15 pages, 3 figures, 1 tabl
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