Using an effective-field theory we study a multicritical behaviour of the mixed spin-1 and spin-3/2 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 multicritical entity is the fourth-order point, which contradicts earlier results obtained within the same theoretical framework.
Bobák, A. (2000). Multicritical points in the mixed spin-1 and spin-3/2 Ising system on a square lattice with different single-ion anisotropies. Physica A: Statistical Mechanics and Its Applications, 286(3), 531–540. https://doi.org/10.1016/S0378-4371(00)00404-0