Ground state phase diagrams for the mixed Ising 3/2 and 5/2 spin model

摘要: Abstract We calculate the ground state phase diagrams of a mixed Ising model on square lattice where spins S (± 3/2, ± 1/2) in one sublattice are alternating sites with Q 5/2, 1/2), located other sublattice. The Hamiltonian includes first neighbor interactions between and spins, next-nearest-neighbor crystal field. topologies depend values parameters Hamiltonian. show some key features: coexistence regions, points two, three, four, five six states can coexist. Besides being very useful as way to check low temperature limit finite-temperature diagram, often obtained by mean-field theories, richness for certain combinations be used guide explore interesting regions diagram model.