Monday, October 22, 2012

1210.5353 (Yanpeng Qi et al.)

Superconductivity in defective pyrite-type iridium chalcogenides IrxCh2
(Ch = Se and Te)
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Yanpeng Qi, Satoru Matsuishi, Jiangang Guo, Hiroshi Mizoguchi, Hideo Hosono
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.
View original: http://arxiv.org/abs/1210.5353

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