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The temperature-dependent phase diagrams of the spin-3/2 Ising model on a FM/AFM two-layer lattice with a crystal field

Author

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  • Albayrak, Erhan
  • Yigit, Ali
  • Cengiz, Tunc

Abstract

The temperature-dependent phase diagrams of the spin-3/2 Ising model on a two-layer Bethe lattice with ferromagnetic (FM)/antiferromagnetic (AFM) intra-layer and either FM or AFM type inter-layer interactions are investigated under a constant magnetic field (H) and in the presence of a crystal field (D) by using exact recursion equations in a pairwise approach for coordination numbers q=3,4 and 6, in detail. In the light of the ground-state (GS) phase diagrams, the temperature-dependent phase diagrams of the model are obtained by studying the thermal variations of the order parameters, response functions and free energy. Then, they are illustrated on the (kT/J1,J3/J1) and (kT/J1,J2/J1) planes for the given system parameters. It is observed that the system exhibits first- and second-order phase transitions for all q values, and hence, in some cases, tricritical points. The existence of critical-end points and that of isolated points are also observed. The re-entrant behavior owes its presence to the two Néel temperatures, TN, that are present for all q.

Suggested Citation

  • Albayrak, Erhan & Yigit, Ali & Cengiz, Tunc, 2010. "The temperature-dependent phase diagrams of the spin-3/2 Ising model on a FM/AFM two-layer lattice with a crystal field," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 389(13), pages 2522-2532.
    • Handle: RePEc:eee:phsmap:v:389:y:2010:i:13:p:2522-2532
    DOI: 10.1016/j.physa.2010.03.004
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