Metamagnets in uniform and random fields

Details Metamagnets in uniform and random fields Metamagnets in uniform and random fields

1999-01-19

arxiv.org/abs/cond-mat/9901187v1

Phys. Rev. B 57 (1998) 8370-8374

Physics

Condensed Matter

Disordered Systems and Neural Networks

14 pages, latex, 3 figures included

Scientific paper

10.1103/PhysRevB.57.8370

We study a two-sublattice Ising metamagnet with nearest and next-nearest-neighbor interactions, in both uniform and random fields. Using a mean-field approximation, we show that the qualitative features of the phase diagrams are significantly dependent on the distribution of the random fields. In particular, for a Gaussian distribution of random fields, the behavior of the model is qualitatively similar to a dilute Ising metamagnet in a uniform field.

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