Theory of oxygen content, ordering and kinetics in 1,2,3 high-temperature superconductors

✍ Scribed by H. Bakker; J.P.A. Westerveld; D.M.R. Lo Cascio; D.O. Welch

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 847 KB
• Volume: 157
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(89)90464-4

✦ Synopsis

A model is presented to describe the oxygen content and ordering in 1,2,3 high-temperature superconducting oxides. A negative site energy, linearly dependent on oxygen content and a repulsive nearest-neighbour energy are postulated. The Ising problem is solved in the pair approximation. The agreement between the theoretical predictions and results of different experiments turns out to he good. The pair approximation is particularly appropriate to describe the oxygen kinetics. The oxygen diffusion coefficient is decomposed into a number of average atomistic quantities, Each of these quantities is calculated as a function of temperature and outside oxygen pressure. Implications for the experimental determination of the oxygen kinetics are discussed.