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

doi:10.1038/srep03101

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

Research output: Contribution to journal › Article

21 Citations (Scopus)

Abstract

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 language	English
Article number	3101
Journal	Scientific reports
Volume	3
DOIs	https://doi.org/10.1038/srep03101
Publication status	Published - 2013 Oct 31
Externally published	Yes

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Kudo, K., Mitsuoka, D., Takasuga, M., Sugiyama, Y., Sugawara, K., Katayama, N., Sawa, H., Kubo, H. S., Takamori, K., Ichioka, M., Fujii, T., Mizokawa, T., & Nohara, M. (2013). Superconductivity in Ca₁₀ (Ir₄ As₈) (Fe₂ As₂)₅ with Square-Planar Coordination of Iridium. Scientific reports, 3, [3101]. https://doi.org/10.1038/srep03101

Superconductivity in Ca₁₀ (Ir₄ As₈) (Fe₂ As₂)₅ with Square-Planar Coordination of Iridium. / Kudo, Kazutaka; Mitsuoka, Daisuke; Takasuga, Masaya; Sugiyama, Yuki; Sugawara, Kento; Katayama, Naoyuki; Sawa, Hiroshi; Kubo, Hiroaki S.; Takamori, Kenta; Ichioka, Masanori; Fujii, Tatsuo; Mizokawa, Takashi; Nohara, Minoru.

In: Scientific reports, Vol. 3, 3101, 31.10.2013.

Research output: Contribution to journal › Article

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abstract = "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.",

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AU - Sugiyama, Yuki

AU - Sugawara, Kento

AU - Katayama, Naoyuki

AU - Sawa, Hiroshi

AU - Kubo, Hiroaki S.

AU - Takamori, Kenta

AU - Ichioka, Masanori

AU - Fujii, Tatsuo

AU - Mizokawa, Takashi

AU - Nohara, Minoru

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AB - 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.

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