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Phase diagram and tricritical behavior of an metamagnet in uniform and random fields |
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| Authors: | Ya-Qiu Liang Guo-Zhu Wei Xiao-Juan Xu |
| Institution: | a School of Physics, Liaoning University, Shenyang 110036, China b College of Science, Northeast University, Shenyang 110006, China c International Center for Material Physics, Academia Sinica, Shenyang 110015, China d Machinery Research Institute of Liaoning Province, Shenyang 110032, China |
| Abstract: | A two-sublattice Ising metamagnet in both uniform and random fields is studied within the mean-field approach based on Bogoliubov’s inequality for the Gibbs free energy. We show that the qualitative features of the phase diagrams are dependent on the parameters of the model and the uniform field values. The tricritical point and reentrant phenomenon can be observed on the phase diagram. The reentrance is due to the competition between uniform and random interactions. |
| Keywords: | Ising metamagnet mean-field theory Tricritical point Reentrant phenomenon |
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