Title: Phase transitions in the Mitsui model
Author(s):

Yu.I. Dublenych (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine )

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 Ω = 0 (Ω is the transverse field), a simple analytical expression for the tricritical temperature and the condition of existence of the tricritical point are obtained. For Ω ≠ 0, systems of equations for the tricritical point and for the condition of its existence are written.

Key words: phase transition, ferroelectric phase, Mitsui model, tricritical point
PACS: 64.60.De, 64.60.Cn, 77.80.-e

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