57Fe and 57Co Mössbauer studies of YBa2Cu3O7−y oxides

✍ Scribed by S. Nasu; M. Yoshida; Y. Oda; K. Asayama; F.E. Fujita; T. Kohara; S. Katsuyama; Y. Ueda; K. Kosuge; T. Shinjo; I.S. Lyubutin

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 177 KB
• Volume: 185-189
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)91656-o

✦ Synopsis

57Co emission M6ssbauer measurements have been performed for YBa2Cu306.92 (1-2-307) as well as YBa2Cu306.O (1-2-306) at room temperature and compared with the results from 57Fe absorber experiments reported previously. It is found that the Co atoms mainly substitute Cul chain sites in 1-2-307 but about 80 % Co atoms occupy Cu2 plane sites in 1-2-306 indicating a magnetically. split sextet. Post annealing in 02 induced a transformation from sextet to doublet D3 rising from S-state Fe3+ at Cu2 sites in 1-2-307.