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

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

Superconductivity 2015-06-11 v1 Materials Science

Authors: Yanpeng Qi , Satoru Matsuishi , Jiangang Guo , Hiroshi Mizoguchi , Hideo Hosono

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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.

Keywords

superconductivity defective pyrite-type iridium chalcogenides metal-insulator transition density functional theory

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@article{arxiv.1210.5353,
  title  = {Superconductivity in defective pyrite-type iridium chalcogenides IrxCh2 (Ch = Se and Te)},
  author = {Yanpeng Qi and Satoru Matsuishi and Jiangang Guo and Hiroshi Mizoguchi and Hideo Hosono},
  journal= {arXiv preprint arXiv:1210.5353},
  year   = {2015}
}

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Phys. Rev. Lett. To appear

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

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