The Blume-Emery-Griffiths model is investigated by use of the cluster variation method in the pair approximation. We determine the regions of the phase space where the reentrant phenomenon takes place. Two regions are found, depending on the sign of the reduced quadrupole-quadrupole coupling strengt
โฆ LIBER โฆ
Multicritical points in the ferromagnetic binary Ising model
โ Scribed by J.A. Plascak
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 662 KB
- Volume
- 198
- Category
- Article
- ISSN
- 0378-4371
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## Abstract Approximate critical temperatures of anisotropic ferromagnetic Ising models are calculated through a recently proposed extended variational method in statistical mechanics. Using a linear chain Ising Hamiltonian in an effective field as trial Hamiltonian, quite good results are obtained