Long-range effects on the pyroelectric coefficient and susceptibility of aferroelectric bilayer with a ferroelectric interfacial coupling areinvestigated by use of the transverse Ising model within the framework ofmean-field theory. The effects of the interfacial coupling and the transversefield on the pyroelectric coefficient and susceptibility of the bilayer areinvestigated by taking into account the long-range interaction. It is foundthat the pyroelectric coefficient and susceptibility increase with the decreaseof the magnitude of the long-range interaction and the interfacial couplingwhen the temperature is lower than the phase transition temperature. We alsofind that the strong long-range interaction, the large transverse field andweak interfacial coupling can lead to the disappearance of some of the peaks ofthe pyroelectric coefficient and susceptibility of the ferroelectric bilayer.The phase transition temperature increases with the increase of the strength ofthe long-range interaction, which is similar to the results obtained inferroelectric multi-layers or superlattice.
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