Superconductivity in the tetragonal phase of La1.9Bi0.1CuO4+δ annealed under high oxygen pressure

Masatsune Kato, Takaaki Aoki, Takashi Noji, Yasuhiro Ono, Yoji Koike, Tomoyuki Hikita, Yoshitami Saito

Research output: Contribution to journalArticlepeer-review


We have investigated the relation between the crystal structure and superconductivity in La1.9Bi0.1CuO4+δ, in which the phase separation observed in La2CuO4+δ is suppressed. A phase diagram in the T-δ plane is given for La1.9Bi0.1CuO4+δ with excess oxygen. For very small δ values, the crystal structure is orthorhombic, and an orthorhombic-tetragonal phase transition occurs markedly at δ ∼ 0.03 in the measured temperature range between 13 and 293 K. Superconductivity is observed in the range of 0.04<δ<0.11. This is clear evidence that high-Tc superconductivity also appears in the tetragonal phase.

Original languageEnglish
Pages (from-to)37-38
Number of pages2
JournalJournal of Superconductivity
Issue number1
Publication statusPublished - 1994 Feb 1


  • High-T superconductivity
  • LaBiCuO
  • crystal structure
  • excess oxygen
  • superconducting transition temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)


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