Phys. Rev. Lett. 94, 047601 (2005) [4 pages]Domain-Enhanced Interlayer Coupling in Ferroelectric/Paraelectric SuperlatticesReceived 6 September 2004; published 2 February 2005 We investigate the ferroelectric phase transition and domain formation in a periodic superlattice consisting of alternate ferroelectric (FE) and paraelectric (PE) layers of nanometric thickness. We find that the polarization domains formed in the different FE layers can interact with each other via the PE layers. By coupling the electrostatic equations with those obtained by minimizing the Ginzburg-Landau functional, we calculate the critical temperature of transition Tc as a function of the FE/PE superlattice wavelength Λ and quantitatively explain the recent experimental observation of a thickness dependence of the ferroelectric transition temperature in KTaO3/KNbO3 strained-layer superlattices. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.047601
DOI:
10.1103/PhysRevLett.94.047601
PACS:
77.80.Bh, 77.55.+f, 77.80.Dj
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