Oxygen-vacancy ordering in the YBa2Cu3Oz basal plane studied by the cluster variation method

1988 ◽  
Vol 50 (5-6) ◽  
pp. 1245-1253 ◽  
Author(s):  
A. Berera ◽  
L. T. Wille ◽  
D. de Fontaine
Keyword(s):  
Oxygen Vacancy ◽  
Basal Plane ◽  
Cluster Variation Method ◽  
Variation Method ◽  
Vacancy Ordering ◽  
Cluster Variation

Vacancy Ordering in the Basal Plane of YB2Cu3Oz

1987 ◽  
Vol 99 ◽  
Author(s):  
L. T. Wille ◽  
A. Berera ◽  
D. De Fontaine ◽  
S. C. Moss
Keyword(s):  
Ground State ◽  
Basal Plane ◽  
Nearest Neighbors ◽  
Cluster Variation Method ◽  
Variation Method ◽  
Two Dimensional ◽  
Pairwise Interactions ◽  
Vacancy Ordering ◽  
Superconducting Compound ◽  
Cluster Variation

ABSTRACTThe ordering in the Cu-O basal plane of the high Tc superconductor YBa2Cu3Oz is investigated. Asymmetric pairwise interactions between nearest and next nearest neighbors are assumed. Ordering instabilities in two-dimensional k-space are mapped out as a function of the interactions and the ordered ground state superstructures consisting of occupied and empty oxygen sites are determined. A temperature-composition phase diagram is calculated by means of the Cluster Variation Method. The thermodynamic behavior of the superconducting compound is discussed in the light of these results.

General Algorithm for the Cluster-Variation Method

1983 ◽  
Vol 28 (5) ◽  
pp. 565-568 ◽  
Author(s):  
J S Desjardins ◽  
O Steinsvoll
Keyword(s):  
Cluster Variation Method ◽  
General Algorithm ◽  
Variation Method ◽  
Cluster Variation
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