Superconductivity in defective pyrite-type iridium chalcogenides IrxCh2 (Ch = Se and Te)
Yanpeng Qi, Satoru Matsuishi, Jiangang Guo, Hiroshi Mizoguchi, and, Hideo Hosono
TL;DR
This paper reports the discovery of superconductivity in defective pyrite-type iridium chalcogenides IrxCh2, with maximum Tc values of 6.4 K and 4.7 K, and explores their electronic phase transitions and structural properties.
Contribution
It introduces superconductivity in IrxCh2 compounds and identifies Ir0.75Ch2 as the parent phase based on experimental and theoretical analysis.
Findings
Superconductivity observed at Tc of 6.4 K and 4.7 K.
Ir0.75Ch2 is near the metal-insulator boundary.
IrxCh2 undergoes nonmetal to metal transitions with increasing x.
Abstract
We report superconductivity in defective pyrite-type iridium chalcogenides IrxCh2. Maximum values of Tc of 6.4 K for Ir0.91Se2 and 4.7 K for Ir0.93Te2 were observed. It was found that Ir0.75Ch2 is close to the boundary between metallic and insulating states and IrxCh2 systems undergo nonmetal to metal transitions as x increases. On the basis of density functional theory calculations and the observed large variation in the Ch-Ch distance with x, we suggest that Ir0.75Ch2 is the parent compound for the present superconductors.
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