Study of the Blume-Emery-Griffiths model on the triangular lattice by the cluster-variation method

The cluster-variation method (CVM) is used to investigate the phase diagram of the Blume-Emery-Griffiths (BEG) model on the triangular lattice. New topologies of the phase diagrams for K |J| < -1 including three antiquadrupolar phases (in the ferromagnetic case; J> 0) and antiquadrupolar and f...

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Bibliographic Details
Published in:Physica A 1994-07, Vol.208 (2), p.287-299
Main Authors: Grigelionis, Gintautas, Rosengren, Anders
Format: Article
Language:English
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Summary:The cluster-variation method (CVM) is used to investigate the phase diagram of the Blume-Emery-Griffiths (BEG) model on the triangular lattice. New topologies of the phase diagrams for K |J| < -1 including three antiquadrupolar phases (in the ferromagnetic case; J> 0) and antiquadrupolar and ferrimagnetic phases (in the antiferromagnetic case; J < 0) are obtained. No previously reported reentrant phenomenon is found. Good accuracy of CVM is confirmed in comparison with the results of the analytic and Monte Carlo calculations.
ISSN:0378-4371
1873-2119
DOI:10.1016/0378-4371(94)00051-4