Two-Dimensional Superconductivity Emerged at Monatomic Bi2- Square Net in Layered Y2O2Bi via Oxygen Incorporation

Ryosuke Sei, Suguru Kitani, Tomoteru Fukumura, Hitoshi Kawaji, Tetsuya Hasegawa

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Discovery of layered superconductors such as cuprates and iron-based compounds has unveiled new science and compounds. In these superconductors, quasi-two-dimensional layers including transition metal cations play principal role in the superconductivity via carrier doping by means of aliovalent-ion substitution. Here, we report on a two-dimensional superconductivity at 2 K in ThCr2Si2-type layered oxide Y2O2Bi possessing conducting monatomic Bi2- square net, possibly associated with an exotic superconductivity. The superconductivity emerges only in excessively oxygen-incorporated Y2O2Bi with expanded inter-net distance, in stark contrast to nonsuperconducting pristine Y2O2Bi reported previously. This result suggests that the element incorporation into hidden interstitial site could be an alternative approach to conventional substitution and intercalation methods for search of novel superconductors.

Original languageEnglish
Pages (from-to)11085-11088
Number of pages4
JournalJournal of the American Chemical Society
Issue number35
Publication statusPublished - 2016 Sep 7

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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