Interface effects in ferroelectric PbTiO$_3$ ultrathin films on a paraelectric substrate

Details Interface effects in ferroelectric PbTiO$_3$ ultrathin films on a paraelectric substrate Interface effects in ferroelectric PbTiO$_3$ ultrathin films on a paraelectric substrate

2006-01-06

arxiv.org/abs/cond-mat/0601123v2

Physics

Condensed Matter

Materials Science

4 pages

Scientific paper

10.1103/PhysRevLett.96.137603

Interface effects on the ferroelectric behavior of PbTiO$_3$ ultrathin films deposited on SrTiO$_3$ substrate are investigated using an interatomic potential approach with parameters fitted to first-principles calculations. We find that the correlation of atomic displacements across the film/substrate interface is crucial for the stabilization of the ferroelectric state in films a few unit-cells thick. We show that the minimum film thickness for the appearance of a spontaneous polarized domain state is not an intrinsic property of the ferroelectric film but depends on the polarizability of the paraelectric substrate. We also observe that the substrate displays an induced polarization with an unusual oscillatory behavior.

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