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We report superconductivity in defective pyrite-type iridium chalcogenidesIrxCh2. Maximum values of Tc of 6.4 K for Ir0.91Se2 and 4.7 K for Ir0.93Te2were observed. It was found that Ir0.75Ch2 is close to the boundary betweenmetallic and insulating states and IrxCh2 systems undergo nonmetal to metaltransitions as x increases. On the basis of density functional theorycalculations and the observed large variation in the Ch-Ch distance with x, wesuggest that Ir0.75Ch2 is the parent compound for the present superconductors.

Superconductivity in defective pyrite-type iridium chalcogenides IrxCh2 (Ch = Se and Te)