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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 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

  • General


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