The mixed spin-1 and spin-32 Ising ferrimagnetic system with different anisotropies is studied within the mean-field theory based on Bogoliubov inequality for the Gibbs free energy. Global phase diagrams are obtained in the temperature-anisotropy plane. In particular we find first-order...

Within an effective-field formalism we study effects of different single-ion anisotropies on the magnetic properties (phase diagram, total and sublattice magnetizations) of a mixed spin-1 and spin-32 Ising ferrimagnetic system on a honeycomb lattice. At a finite temperature we obtain quite a...

Using an effective-field theory we study a multicritical behaviour of the mixed spin-1 and spin-32 Ising model with different anisotropies on a square lattice. We find a variety of topologies of the finite-temperature phase diagrams, with several multicritical points. The highest-order...

A mixed-spin Ising model on a decorated Bethe lattice is rigorously solved by combining the decoration–iteration transformation with the method of exact recursion relations. Exact results for critical lines, compensation temperatures, total and sublattice magnetizations are obtained from a...

Using the effective-field theory with correlations (EFT), the effects of a longitudinal field on the magnetic properties of a ferrimagnetic system, consisting of two triangular magnetic sublattices A and B (with a coordination number z=6) with spins SA=12 and SB=32, are investigated. The...

We study the ground-state and thermal entanglement in the mixed-spin (S,s)=(1,1/2) Heisenberg chain with single-ion anisotropy D using exact diagonalization of small clusters. In this system, a quantum phase transition is revealed to occur at the value D=0, which is the bifurcation point for the...

The phase diagram of the ABpC1−p mixed ferro-ferrimagnetic ternary alloy consisting of Ising spins sA=1, sB=32, and sC=12 is investigated by the use of a mean-field theory based on the Bogoliubov inequality for the Gibbs free energy. The effect of the single-ion anisotropy on the transition...

We have determined exactly the ground-state phase diagrams of the ABpC1−p ternary alloy consisting of Ising spins SA=32,SB=1, and SC=52 in the presence of a single-ion anisotropy. We have found that the ground-state phase diagrams include totally thirteen different ordered phases and one...