M. Keskin et H. Arslan, STABLE, METASTABLE AND UNSTABLE SOLUTIONS OF A SPIN-1 ISING SYSTEM INTHE PRESENCE OF MAGNETIC-FIELDS DUE TO THE DIPOLE AND QUADRUPOLE-MOMENTS, Journal of magnetism and magnetic materials, 146(3), 1995, pp. 247-250
The spm-1 Ising model with bilinear (J) and biquadratic (K) interactio
ns is studied for magnetic fields H-S and H-Q representing dipole and
quadrupole moments, respectively, by using the lowest approximation of
the cluster variation method. The influence of H-S, H-Q, and alpha =
J/K on metastable and unstable solutions, which are very important for
many theoretical and experimental works, is investigated and it is fo
und that metastable and unstable solutions occur at high temperatures
when alpha and H-Q increased. However if H-S is increased, metastable
and unstable solutions can be found only at low temperatures.