Correlation between Tc and hole concentration in the cation-substituted Bi2Sr2CaCu2O8+δ system

✍ Scribed by Yoji Koike; Yoshihiro Iwabuchi; Syoichi Hosoya; Norio Kobayashi; Tetsuo Fukase

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 434 KB
• Volume: 159
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(89)90110-x

✦ Synopsis

Correlation between superconducting T~ and hole concentration was investigated in the Bi2Sr2CaCu208+~ system. The hole concentration was varied by substituting cations with different valences for Sr or Ca. In order to increase the hole concentration, some samples were annealed at 430°C in 250 bar of oxygen pressure. We find that Tc increases, takes a maximum at the hole concentration corresponding to 0.2-0.3 holes per CuO2 unit, and then decreases, with increasing hole concentration. This correlation is markedly similar to those in the La2_xSrxCuO4 and YBa2Cu307_~ systems.