Ferroelectricity and tetragonality in ultrathin PbTiO3 films

Details Ferroelectricity and tetragonality in ultrathin PbTiO3 films Ferroelectricity and tetragonality in ultrathin PbTiO3 films

2004-04-09

arxiv.org/abs/cond-mat/0404228v2

Physics

Condensed Matter

Materials Science

4 pages, Tex, 3 figures Update: A few changes were made. These are mainly more explicit references to the literature regarding

Scientific paper

10.1103/PhysRevLett.94.047603

The evolution of tetragonality with thickness has been probed in epitaxial c-axis oriented PbTiO3 films with thicknesses ranging from 500 down to 24 Angstroms. High resolution x-ray pointed out a systematic decrease of the c-axis lattice parameter with decreasing film thickness below 200 Angstroms. 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 Angstroms display a significantly reduced polarization but still remain ferroelectric.

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