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Ground-State Phase Diagram of Transverse Spin-2 Ising Model with Longitudinal Crystal-Field
Authors:ZHAO Jie  WEI Guo-Zhu  XU Xing-Gaang
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.
Keywords:transverse spin-2 Ising model  longitudinal crystal field  ground state  phase diagram  first orderorder phase transition
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