Ma. Costa et Ll. Goncalves, RANDOMLY DECORATED ISING-MODEL ON THE SQUARE LATTICE, Journal of magnetism and magnetic materials, 140, 1995, pp. 2193-2194
The two-dimensional Ising model decorated with Ising spins of magnitud
es s = 1 and 1/2 is considered. The bonds are randomly decorated with
n spins and the random variable is supposed to satisfy an annealed dis
tribution. The model is exactly solved by mapping it onto an effective
2D Ising model. The phase diagram is determined and the lim n --> inf
inity is discussed.