Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2011-06-25
Condens. Matter Phys., 2011, vol. 14, No. 2, 23603:1-20
Physics
Condensed Matter
Statistical Mechanics
20 pages, 21 figures
Scientific paper
10.5488/CMP.14.23603
In this paper, phase transitions in the Mitsui model without longitudinal field but with a transverse one are investigated in the mean field approximation. The one-to-one correspondence has been established between this model and the two-sublattice Ising-type model with longitudinal and transverse fields. Phase diagrams and diagrams of existence of the ferroelectric phase are constructed. In the case $\Omega =0$ ($\Omega$ is the transverse field), a simple analytical expression for the tricritical temperature and the condition of existence of the tricritical point are obtained. For $\Omega \ne 0$, systems of equations for the tricritical point and for the condition of its existence are written.
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