scholarly journals Cluster variation method and disorder varieties of two-dimensional Ising-like models

2000 ◽  
Vol 61 (17) ◽  
pp. 11510-11513 ◽  
Author(s):  
Alessandro Pelizzola
Keyword(s):  
Cluster Variation Method ◽  
Variation Method ◽  
Two Dimensional ◽  
Cluster Variation

Cluster variation method for two-dimensional Hubbard and t-J models

1994 ◽  
Vol 235-240 ◽  
pp. 2187-2188 ◽  
Author(s):  
Kazunuki Tanaka ◽  
Hiromichi Ebisawa ◽  
Tohru Morita
Keyword(s):  
Cluster Variation Method ◽  
Variation Method ◽  
Two Dimensional ◽  
Cluster Variation

Order—Disorder Behavior of Grain Boundaries in a two Dimensional Mcdel Ordered Alloy

1986 ◽  
Vol 81 ◽  
Author(s):  
Diana Farkas ◽  
Ho Jang
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Pair Interaction ◽  
Cluster Variation Method ◽  
Boundary Region ◽  
Variation Method ◽  
Two Dimensional ◽  
Interaction Energies ◽  
Disordered Layer ◽  
Cluster Variation

AbstractThe order-disorder behavior of a Σ = 5 grain boundary was investigated using a two dimensional latice gas model and the cluster variation method. It is found that a disordered layer forms in the grain boundary region at temperatures significantly below theorder—disorder temperature for the bulk. Under certain assumptions for the pair interaction energies the model predicts grain boundary compositions different from the bulk.

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.

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