A Study of Oguchi Approximation (OA) for Ising-Spin Magnetic Model

Abstract

An isospin magnetic system with spin values S=1 is studied for square and
simple cubic lattice, the curie temperature has been calculated for these
lattices based on the usual Oguchi approximation (OA).Within this scheme
considered here, four atoms are considered where the three nearest-neighbor
spin correlation are taken into account when the Hamiltonian is derived. The
results for the critical temperature are remarkably accurate comparing to the
effective field ones.