Theoretical Prediction of the Orthorhombic (II) Phase in the YBa2Cu3O7-δ System
- 1 December 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (12A) , L1988-1990
- https://doi.org/10.1143/jjap.26.l1988
Abstract
The existence of the orthorhombic(II) phase in the YBa2Cu3O7-δ system is derived by a model calculation of the oxygen order-disorder transformation on the Cu(1) plane. The repulsion interaction energy between the second-nearest-neighboring oxygen atoms contributes to the occurrence of the orthorhombic(I)-orthorhombic(II) transformation while the first-nearest interaction gives rise to the tetragonal-orthorhombic(I) transformation. The structure of the orthorhombic(II) phase is considered to be an alternately-ordered state of the oxygen atoms within the a-axis site.Keywords
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