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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.25 no.5-6 (1998), pp. 233-236
Correspondence Between Spin-1 and Spin-1/2 Models — Mean-Field Approximation
V.D. Karaivanov
Faculty of Physics, University of Sofia, 5 J. Bourchier Blvd, I I 64 Sofia, Bulgaria
go backFaculty of Physics, University of Sofia, 5 J. Bourchier Blvd, I I 64 Sofia, Bulgaria
Abstract. It is shown that for the mean-field approximation the spin-1 model of Blume-Emery-Griffins (BEG-model) corresponds exactly, in the relation to the phase transition, to the spin-1/2 Ising model when the number of the nearest neighbours z is replaced by cz, where c (0 ≤ c ≤ 1) is the concentration of sites with nonzero spin in the BEG-model.