Some reentrant and compensation characteristics of a defective mixed-spin Ising bilayer graphene-like structure

We have performed the finite cluster approximation, to explore some interesting characteristics of a bond-diluted mixed-spin Ising bilayer graphene-like structure, composed of a ferrimagnetically alternating A-layer with spin-3/2 and B-layer with spin-1. The implication of the diluted exchange couplings (J_A, J_B), as well as the crystal fields (D_A, D_B) on the phase diagrams and magnetizations, have been evaluated. In the pure case (p_S = p_σ = 1.0), compensation points arise only if J_B exceeds a J_A-dependent threshold value. The inclusion of defect shows that the compensation points are favored under the p_S effect, contrarily to p_σ awakening the J_B strength, which destroys the compensation. By introducing the crystal fields, we have uncovered the possibility of a first-order transition under the D_B effect. Finally, an unexpected reentrance has been identified, regardless of the bond concentrations (p_S, p_σ) or crystal fields (D_A, D_B) values.