A discussion of mean–field theory in ising spin models

Abstract EN

IN this work an isospin system with spin values S 1 is studied through introducing improvement on a mean-field method for Ising spin system.

The method is based on an extended Oguchi approximation (OA).

Within this scheme, three atoms are considered where the two nearest-neighbour spin correlation are taken into account when the Hamiltonian is presented.

The result obtatined for the Curi temp.

are more accurate compared with mean-field approximation (MFA) and Oguchi models Atable is stateed for comparison purposes, bet the present results and that of Curi temp.

for approximation refeed earliear respectively.