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

被引：11
|
作者：
MORANLOPEZ, JL
SANCHEZ, JM
机构：
[1] UNIV TEXAS,CTR MAT SCI & ENGN,AUSTIN,TX 78712
[2] UNIV AUTONOMA SAN LUIS POTOSI,INST FIS,SAN LUIS POTOSI,MEXICO
来源：
PHYSICA C | 1993年 / 210卷 / 3-4期
关键词：
D O I：
10.1016/0921-4534(93)90983-W
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The thermodynamics of oxygen ordering in the basal plane of YBa2Cu3O6+delta is studied within the nine point approximation of the cluster variation method. The phenomena is modeled by an Ising model with nearest- and next-nearest-neighbor interactions. The composition (delta) versus 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 temperatures is also presented.
引用
收藏
页码：401 / 407
页数：7
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