THE PHASE-DIAGRAM OF OXYGEN ORDERING IN YBA2CU3O6- THE 9-POINT CLUSTER APPROXIMATION(DELTA )

Authors
MORANLOPEZ JL SANCHEZ JM
Citation
Jl. Moranlopez et Jm. Sanchez, THE PHASE-DIAGRAM OF OXYGEN ORDERING IN YBA2CU3O6- THE 9-POINT CLUSTER APPROXIMATION(DELTA ), Physica. C, Superconductivity, 210(3-4), 1993, pp. 401-407
Citations number
23
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
210
Issue
3-4
Year of publication
1993
Pages
401 - 407
Database
ISI
SICI code
0921-4534(1993)210:3-4<401:TPOOOI>2.0.ZU;2-G
Abstract
The thermodynamics of oxygen ordering in the basal plane of YBa2Cu3O6delta is studied within the nine point approximation of the cluster va riation method. The phenomena is modeled by an Ising model with neares t- and next-nearest-neighbor interactions. The composition (delta) ver sus the temperature (T) phase diagram is calculated and compared with results obtained by using smaller clusters and the Monte Carlo method. The composition dependence of the order parameters for various temper atures is also presented.