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Evidence for the ferromagnetic frustration in a classical spin-1∕2 system with multisite interaction in external magnetic field: Exact results

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  • Jurčišinová, E.
  • Jurčišin, M.

Abstract

We investigate the influence of the multisite interaction among sites within elementary triangles of the kagome-like recursive lattice on the properties of the classical spin-1∕2 ferromagnetic Ising model in the external magnetic field. The exact solution of the model is found and it is shown that the model exhibits a nontrivial structure of the first order as well as second order phase transitions in nonzero external magnetic fields related to the multisite interaction. The equation for the exact determination of the positions of the critical points of the second order phase transitions is derived. The thermodynamic properties of the model are investigated in detail and it is shown that the competition between the ferromagnetic interaction and the multisite interaction leads to the appearance of strong ferromagnetic frustration effects represented by the formation of a nontrivial system of macroscopically degenerated plateau-like and single-point-like ground states. The residual entropies of all ground states are found and the kagome spin-ice-like highly macroscopically degenerated plateau state with nonzero magnetization is identified with the exact residual entropy per site s∕kB=ln(4∕3)∕3≈0.095894. The properties of the specific heat are investigated, its Schottky-type behavior near the single-point ground state values of the magnetic field is identified, the existence of large magnetocaloric effect is discussed, and the existence of the first order phase transitions without the specific heat capacity change is demonstrated.

Suggested Citation

  • Jurčišinová, E. & Jurčišin, M., 2017. "Evidence for the ferromagnetic frustration in a classical spin-1∕2 system with multisite interaction in external magnetic field: Exact results," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 486(C), pages 296-317.
    • Handle: RePEc:eee:phsmap:v:486:y:2017:i:c:p:296-317
    DOI: 10.1016/j.physa.2017.05.095
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    References listed on IDEAS

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    1. Ananikian, N.S. & Izmailian, N.Sh. & Oganessyan, K.A., 1998. "An Ising spin-S model on generalized recursive lattice," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 254(1), pages 207-214.
    2. Monroe, James L., 1998. "Frustrated Ising systems on Husimi trees," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 256(1), pages 217-228.
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