Superconductivity in Ca10(Ir4As8)(Fe2As2)5 with Square-Planar Coordination of Iridium

Kazutaka Kudo; Daisuke Mitsuoka; Masaya Takasuga; Yuki Sugiyama; Kento Sugawara; Naoyuki Katayama; Hiroshi Sawa; Hiroaki S. Kubo; Kenta Takamori; Masanori Ichioka; Tatsuo Fujii; Takashi Mizokawa; Minoru Nohara

doi:10.1038/srep03101

Superconductivity in Ca10(Ir4As8)(Fe2As2)5 with Square-Planar Coordination of Iridium

Superconductivity 2013-11-07 v1 Strongly Correlated Electrons

Authors: Kazutaka Kudo , Daisuke Mitsuoka , Masaya Takasuga , Yuki Sugiyama , Kento Sugawara , Naoyuki Katayama , Hiroshi Sawa , Hiroaki S. Kubo , Kenta Takamori , Masanori Ichioka , Tatsuo Fujii , Takashi Mizokawa , Minoru Nohara

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Abstract

We report the unprecedented square-planar coordination of iridium in the iron iridium arsenide Ca10(Ir4As8)(Fe2As2)5. This material experiences superconductivity at 16 K. X-ray photoemission spectroscopy and first- principles band calculation suggest Ir(II) oxidation state, which yields electrically conductive Ir4As8 layers. Such metallic spacer layers are thought to enhance the interlayer coupling of Fe2As2, in which superconductivity emerges, thus offering a way to control the superconducting transition temperature.

Keywords

superconductivity iron pnictides square-planar coordination iridium interlayer coupling electronic structure

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@article{arxiv.1311.1280,
  title  = {Superconductivity in Ca10(Ir4As8)(Fe2As2)5 with Square-Planar Coordination of Iridium},
  author = {Kazutaka Kudo and Daisuke Mitsuoka and Masaya Takasuga and Yuki Sugiyama and Kento Sugawara and Naoyuki Katayama and Hiroshi Sawa and Hiroaki S. Kubo and Kenta Takamori and Masanori Ichioka and Tatsuo Fujii and Takashi Mizokawa and Minoru Nohara},
  journal= {arXiv preprint arXiv:1311.1280},
  year   = {2013}
}

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17 pages, 5 figures, 2 tables

Superconductivity in Ca10(Ir4As8)(Fe2As2)5 with Square-Planar Coordination of Iridium

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