Modified cluster-field method for statistics of ordering systems
V E Zubkus; S Lapinskas; V E Zubkus; Inst. of Semicond. Phys., Acad. of Sci., Vilnius, Lithuanian SSR, USSR; S Lapinskas; Inst. of Semicond. Phys., Acad. of Sci., Vilnius, Lithuanian SSR, USSR
Журнал:
Journal of Physics: Condensed Matter
Дата:
1990-02-19
Аннотация:
A relatively simple cluster approximation for the investigation of the phase transition thermodynamics in order-disorder systems is proposed. The approximation is demonstrated on the square and simple-cubic Ising lattices with nearest-neighbour ferromagnetic coupling. The accuracy of the approximation is shown to be no worse than that of the well known cluster-variation method (CVM). At the same time the modified cluster-field method has fewer variational parameters and is easier to use than the CVM, allowing use of larger clusters for better accuracy.
649.8Кб