Abstract.
The spin-1 Ising model with bilinear and quadrupolar short-range interactions under magnetic field is investigated within the two-particle cluster approximation. It is shown that for those values of the quadrupolar interaction when at zero magnetic field the system undergoes a temperature phase transition between quadrupolar and paramagnetic phases, a triple point may exist in the temperature vs. magnetic field phase diagrams, necessarily along with a critical point. It is also shown that the critical points in the temperature vs. magnetic field phase diagrams of the investigated model can be of three types.
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Levitskii, R., Baran, O. & Lisnii, B. Phase diagrams of spin-1 Ising model with bilinear and quadrupolar interactions under magnetic field. Two-particle cluster approximation. Eur. Phys. J. B 50, 439–443 (2006). https://doi.org/10.1140/epjb/e2006-00162-5
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DOI: https://doi.org/10.1140/epjb/e2006-00162-5