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

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...

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Bibliographic Details
Published in:arXiv.org 2013-11
Main Authors: 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
Format: Article
Language:English
Subjects:
Arsenides
Interlayers
Iridium
Oxidation
Photoelectric emission
Superconductivity
Transition temperature
Valence
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1311.1280