Abstract
The ferromagnetic mixed spin- 1 2 and spin-1 Ising system with a crystal-field interaction is studied within the framework of the exact recursion relations on the two-fold Cayley tree. The effect of the coordination number on the phase diagrams is investigated. The tricritical point has been observed in our calculations for q ⩾ 5 . The results are compared with those of other approximate methods.
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