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Critical behavior of an Ising metamagnet in uniform and random fields

✍ Scribed by D.C. de Oliveira; A.A.P. da Silva; Douglas F. de Albuquerque; Alberto S. de Arruda

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
171 KB
Volume
386
Category
Article
ISSN
0378-4371

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✦ Synopsis

We use an effective field method to analyze the thermodynamic behavior of an Ising metamagnet in uniform and random magnetic fields. Depending on the strength of the random fields, we show that the phase diagram displays a tricritical point and reentrant second-order transition lines. This reentrance is due to the competition between uniform and random interactions.

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We apply the Wang-Landau method to the study of the critical behavior of the three-dimensional random field Ising model with a bimodal probability distribution. For high values of the random field intensity we find that the energy probability distribution at the transition temperature is double peak