Abstract
We use the Ginzburg-Landau theory to study the ferroelectric system consisting of the sandwich structure (PbTiC3/BaTiC3/PbTiC3). We find that after introducing the long-range coupling interaction, the average spontaneous polarization of the interlayer (BaTiO3) increases and the size-driven phase transition does not occur. The larger the range of the long-range coupling, the larger the average spontaneous polarization. When the range of the long-range coupling is enough large, the average spontaneous polarization increases gradually with decreasing the interlayer thickness, reaches one maximum at a certain finite thickness, and then decreases.
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