Superconductivity in Defective Pyrite-Type Iridium Chalcogenides IrxCh2 (Ch=Se and Te)
Yanpeng Qi, Satoru Matsuishi, Jiangang Guo, Hiroshi Mizoguchi, Hideo Hosono
DOI 10.1103/PhysRevLett.109.217002 · Physical Review Letters
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Abstract
We report superconductivity in defective pyrite-type iridium chalcogenides IrxCh2 (Ch=Se and Te). 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 (Ir3Ch8) 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 (Ir3Ch8) is the parent compound for the present superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ir0.91Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.4 | Pressure not reported | zero_resistance |
| Ir0.91Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.4 | Pressure not reported | onset |
| Ir0.91Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.4 | Pressure not reported | unknown |
| Ir0.93Te2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.7 | Pressure not reported | zero_resistance |
| Ir0.93Te2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.7 | Pressure not reported | onset |
| Ir0.77Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | Pressure not reported | zero_resistance |
| IrTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.1 | Pressure not reported | unknown |
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