Abstract
Dilute anisotropic Heisenberg ferromagnets have been studied by an effective field theory based on a two-site cluster approximation with an Ising character assumed for the surrounding spins. The results for the Curie temperature, T C , and the critical concentration for magnetic ordering, are improvements on those of a single-site approximation where the exchange anisotropy cannot be accounted for. The initial reduction in T C with dilution is confirmed to decrease with increases in both the lattice coordination number and exchange anisotropy. Finally, by utilising its connection with the zero-temperature magnetization for the Ising system, the percolation probability is examined.
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