Superconductivity in Ca10 (Ir4 As8) (Fe2 As2)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

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21 Citations (Scopus)


We report the unprecedented square-planar coordination of iridium in the iron iridium arsenide Ca 10 (Ir 4 As 8)(Fe 2 As 2) 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 Ir 4 As 8 layers. Such metallic spacer layers are thought to enhance the interlayer coupling of Fe 2 As 2, in which superconductivity emerges, thus offering a way to control the superconducting transition temperature.

Original languageEnglish
Article number3101
JournalScientific reports
Publication statusPublished - 2013 Oct 31
Externally publishedYes

ASJC Scopus subject areas

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