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arxiv: 1311.1280 · v1 · pith:BMGB5IZUnew · submitted 2013-11-06 · ❄️ cond-mat.supr-con · cond-mat.str-el

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
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Kenta Takamori Masanori Ichioka Tatsuo Fujii Takashi Mizokawa Minoru Nohara
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classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords fe2as2ir4as8iridiumsuperconductivityca10coordinationlayerssquare-planar
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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.

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