Ternary-Spin Ising Model on an Anisotropically Decorated Square Lattice:   An Exactly Solvable Case
  Magnetic properties of a ternary-spin Ising model on the decorated square lattice are studied within a generalized decoration-iteration transformation. Depending on the mutual ratio between exchange interactions and the single-ion anisotropy, there appear six different phases in the ground state. The magnetic order of these phases together with the critical behaviour and corresponding magnetization curves are discussed in detail. 
Lucia Canova, Jozef Strecka and Jan Dely