Abstract
An Ising model with two-spin interactions and three-spin interactions on the diced lattice is investigated. The investigation is extended to a mixed spin model consisting of Ising spins of ±1 and those of magnitude s , and one consisting of Ising spins of ±1 and classical n -vector spins. It turns out that these systems belong to the same universality class as the Baxter-Wu model. The other related models on the diced lattice are also discussed.
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