Oxygen nonstoichiometry and Tc-variation in TlSr2(Ca1−xLux)Cu2Oy(x=0−1.0)

✍ Scribed by T. Kondo; Y. Kubo; Y. Shimakawa; T. Manako; H. Igarashi

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 191 KB
• Volume: 185-189
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)92137-z

✦ Synopsis

T,-variations due to cation substitution and oxygen nonstoichiometry in TISr,(Ca,.+Lu,)Cu,O,are investigated. with increasing x from 0 to 1.0, the system changes from a nonsuperconducting normal metal to a semiconductor, via a 90-K superconductor. Oxygen nonstoichiometry causes dramatic changes in superconductivity. 7, of the oxygen-annealed sample is increased by Ar reduction for tiO.6, while it is decreased for x=0.8. These resutts indicate that the carrier concentration becomes optimum at around x=0.7 for oxygenated samples.