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Critical behavior of an Ising metamagnet in uniform and random fields |
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| Authors: | DC de Oliveira Douglas F de Albuquerque |
| Institution: | a Departamento de Física, Universidade Federal de Mato Grosso do Sul, Campo Grande, MS, Brazil b Departamento de Matemática, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil c Departamento de Física, Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil |
| Abstract: | 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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