Abstract
The authors present a calculation of the tricritical point in a dilute Ising metamagnet, in which planar correlations are treated in a Bethe-Peierls approximation. For dilutions approaching the percolation limit of the ferromagnetically coupled planes the tricritical temperature falls to zero while the tricritical field stays finite, in agreement with experiments on FepMg1-pCl2. Quantitative discrepancies are related to the effects of critical fluctuations.
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