Nickel-based oxyphosphide superconductor with a layered crystal structure, LaNiOP

Takumi Watanabe, Hiroshi Yanagi, Toshio Kamiya, Yoichi Kamihara, Hidenori Hiramatsu, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

266 Citations (Scopus)


A layered oxyphosphide, LaNiOP, was synthesized by solid-state reactions. This crystal was confirmed to have a layered structure composed of an alternating stack of (La3+O2-)+ and (Ni 2+P3-)-. We found that the resulting LaNiOP shows a superconducting transition at ∼3 K. This material exhibited metallic conduction and Pauli paramagnetism in the temperature range of 4-300 K. The resistivity sharply dropped to zero and the magnetic susceptibility became negative at <4 K, indicating that a superconducting transition occurs. The volume fraction of the superconducting phase estimated from the diamagnetic susceptibility reached ∼40 vol % at 1.8 K, substantiating that LaNiOP is a bulk superconductor.

Original languageEnglish
Pages (from-to)7719-7721
Number of pages3
JournalInorganic Chemistry
Issue number19
Publication statusPublished - 2007 Sept 17
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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