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

✍ Scribed by Masatsune Kato; Takaaki Aoki; Takashi Noji; Yasuhiro Ono; Yoji Koike; Tomoyuki Hikita; Yoshitami Saito

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 512 KB
• Volume: 217
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90811-4

✦ Synopsis

The relationship between the crystal structure and superconductivity has been investigated for Lat.gBio.iCuO4+6 with excess oxygen. A phase diagram in the T--6 plane is given for this system, where the phase separation observed in La2CuO4+8 is suppressed. For very small values of d the crystal structure is orthorhombic, and an orthorhombic-tetragonal phase transition occurs markedly at 6~ 0.03 in the measured temperature range between 13 and 293 K. A superconducting phase is observed in the range of 0.04 < d< 0.11. This is clear evidence that high-To superconductivity also appears in the tetragonal phase.