Abstract
The critical behavior of a mixed ferromagnetic Ising spin system consisting of spin\(-\tfrac{1}{2}\) and spin-1 with a crystal-field interaction is investigated by the use of the effective-field theory with correlations. The general expressions for evaluating the Curie temperature and the tricritical point are obtained. We find that the tricritical point exists in the system with Z >3, where Z is the coordination number.
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