Phase diagrams of spin-1 Ising model with bilinear and quadrupolar interactions under magnetic field. Two-particle cluster approximation
Institute for Condensed Matter Physics, 1 Svientsitskii Str., L'viv, 79011, Ukraine
Corresponding author: a email@example.com
Revised: 8 February 2006
Published online: 5 May 2006
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.
PACS: 74.25.Ha – Magnetic properties / 75.10.-b – General theory and models of magnetic ordering / 75.10.Hk – Classical spin models
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006