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

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  • De La Espriella, N.
  • Buendía, G.M.

Abstract

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

Suggested Citation

  • De La Espriella, N. & Buendía, G.M., 2010. "Ground state phase diagrams for the mixed Ising 3/2 and 5/2 spin model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 389(14), pages 2725-2732.
    • Handle: RePEc:eee:phsmap:v:389:y:2010:i:14:p:2725-2732
    DOI: 10.1016/j.physa.2010.03.022
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    Cited by:

    1. De La Espriella, N. & Madera, J.C. & Sánchez-Caraballo, A., 2018. "Reentrant and spin compensation phenomena in an Ising type ferrimagnetic system," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 511(C), pages 289-301.

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