Phys. Rev. Lett. 93, 196104 (2004) [4 pages]Ultrathin Films of Ferroelectric Solid Solutions under a Residual Depolarizing FieldReceived 17 March 2004; published 5 November 2004 A first-principles-derived approach is developed to study the effects of depolarizing electric fields on the properties of Pb(Zr,Ti)O3 ultrathin films for different mechanical boundary conditions. A rich variety of ferroelectric phases and polarization patterns is found, depending on the interplay between strain and the amount of screening of surface charges. Examples include triclinic phases, monoclinic states with in-plane and/or out-of-plane components of the polarization, homogeneous and inhomogeneous tetragonal states, as well as peculiar laminar nanodomains. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.196104
DOI:
10.1103/PhysRevLett.93.196104
PACS:
68.55.–a, 77.22.Ej, 77.80.Bh, 77.84.Dy
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