Crystal structure and superconductivity in La1.9Bi0.1CuO4+δ with excess oxygen. Superconductivity in the tetragonal phase

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

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The relationship between the crystal structure and superconductivity has been investigated for La1.9Bi0.1CuO4+δ with excess oxygen. A phase diagram in the T-δ plane is given for this system, where the phase separation observed in La2CuO4+δ is suppressed. For very small values of δ 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. A superconducting phase 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)188-196
Number of pages9
JournalPhysica C: Superconductivity and its applications
Issue number1-2
Publication statusPublished - 1993 Nov 10

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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