AN ISING-MODEL APPROACH TO THE PROBLEM OF OXYGEN ORDERING IN THE BASAL-PLANE OF YBA2CU3O6+2C

被引：13

作者：

MATIC, VM

机构：

[1] Laboratory for Theoretical Physics, Boris Kidric Institute, Vinca, P.O. Box 522

来源：

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS | 1992年 / 184卷 / 3-4期

关键词：

D O I：

10.1016/0378-4371(92)90323-I

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Oxygen ordering in the basal plane of the YBa2Cu3O6+2c system can be described in terms of the two-dimensional Ising model with asymmetric next-nearest-neighbor interactions. The phase diagram is calculated by means of a cluster variation method, using the values of interaction energies which follow from the linear muffin-tin orbital (LMTO) method, and compared with previous known results. The low-temperature structure is examined and it is found that O-Cu-O chains consist of oxygen occupied and unoccupied segments. The average number of oxygen atoms in oxygen occupied segments is calculated as a function of temperature T and concentration c.

引用

页码：571 / 586

页数：16

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