Abstract
The Curie temperature of a ferroelectric superlattice formed from two alterating materials was studied using the transverse Ising model in the mean-field theory. The dependence of the Curie temperature on the interface coupling strength J AB and the layer-number of the two slabs in one period were obtained. Assuming the bulk Curie temperature of slab B is higher than that of slab A, the Curie temperature of the superlattice increases with the increases in J AB, but decreases with increasing the layer- number of slab A. While fixing the layer-number of slab A, there exists a critical interface coupling strength J c; as the layer- number of slab B increases, the Curie temperature increases for J AB< J c but decreases for J AB> J c. The temperature dependence of the spin average in the two slabs we also calculated.
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