Variation of Tricritical Point of a Metamagnet with Dilution

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  • Variation of Tricritical Point of a Met

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Tricritical point (TCP) of a dilute metamagnet is investigated by the Takagi approximation on the basis of Ising meta-model. It is shown that the tricritical temperature decreases when the system is diluted by non-magnetic atoms, and becomes zero at the concentration cp, which coincides with the critical concentration of a ferromagnetic plane in the same approximation, despite of essentially three-dimensional nature of the metamagnetic transition. It is also shown that, in contrast to the tricritical temperature, the tricritical field tends to a finite value with dilution.<BR>The results obtained agree qualitatively with the magneto-optical study of dilute metamagnet FecMg1−cCl2 by Wood and Day.

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