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Ferroelectricity and Tetragonality in Ultrathin PbTiO3 Films

Junquera, Javier
Ghosez, Philippe
Published in Physical Review Letters. 2005, vol. 94, no. 4, p. 047603-1
Abstract The evolution of tetragonality with thickness has been probed in epitaxial c-axis oriented PbTiO3 films with thicknesses ranging from 500 down to 24 Angstrom. High resolution x ray pointed out a systematic decrease of the c-axis lattice parameter with decreasing film thickness below 200 Angstrom. Using a first-principles model Hamiltonian approach, the decrease in tetragonality is related to a reduction of the polarization attributed to the presence of a residual unscreened depolarizing field. It is shown that films below 50 Angstrom display a significantly reduced polarization but still remain ferroelectric.
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Research group Groupe Triscone
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LICHTENSTEIGER, Céline et al. Ferroelectricity and Tetragonality in Ultrathin PbTiO3 Films. In: Physical Review Letters, 2005, vol. 94, n° 4, p. 047603-1. https://archive-ouverte.unige.ch/unige:23538

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Deposited on : 2012-10-24

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