Ground-State Phase Diagram of Transverse Spin-2 Ising Model with Longitudinal Crystal-Field |
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Authors: | ZHAO Jie WEI Guo-Zhu XU Xing-Gaang |
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Abstract: | The transverse spin-2 Ising ferromagnetic model with a longitudinal crystal-field is studied within the mean-field theory based on Bogoliubov inequality for the Gibbs free energy. The ground-state phase diagram and the tricritical point are obtained in the transverse field Ω/z J-longitudinal crystal D/zJ field plane. We find that there are the first order-order phase transitions in a very smallrange of D/zJ besides the usual first order-disorder phase transitions and the second order-disorder phase transitions. |
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Keywords: | transverse spin-2 Ising model longitudinal crystal field ground state phase diagram first orderorder phase transition |
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