Multicritical points in the mixed spin-1 and spin-3/2 Ising system on a square lattice with different single-ion anisotropies

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Abstract

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.

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