Abstract
A random-field Ising model with second-neighbour interaction has been investigated using the new effective-field theory. The phase diagrams are examined in detail for the square lattice in a random field obeying the bimodal symmetric distribution. A tricritical point is found in the system, in contrast to the corresponding nearest-neighbour interaction Ising model. In particular, the tricritical phase diagram for a body-centered cubic lattice in nearest-neighbour approximation is also determined.
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