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The effects of lithium absorption on the crystal structure and electronicproperties of IrSi3, a binary silicide with a noncentrosymmetric crystalstructure, were studied. X-ray and neutron diffraction experiments revealedthat hexagonal IrSi3 (space group P6_3mc) transforms into trigonal Li2IrSi3(space group P31c) upon lithium absorption. The structure of Li2IrSi3 is foundto consist of a planar kagome network of silicon atoms with Li and Ir spaced atunequal distances between the kagome layers, resulting in a polar structurealong the c-axis. Li2IrSi3 exhibited type-II superconductivity with atransition temperature Tc of 3.8 K, displaying a structure type that noprevious superconductors have been reported to have.

Superconductivity in Noncentrosymmetric Iridium Silicide Li2IrSi3