Polar domains in lead titanate films under tensile strain

Details Polar domains in lead titanate films under tensile strain Polar domains in lead titanate films under tensile strain

2005-12-24

arxiv.org/abs/cond-mat/0512632v2

Physical Review Letters 96, 127602 (2006)

Physics

Condensed Matter

Materials Science

Nature of changes: Slightly modified abstract, introduction and conclusion paragraphs to make it more accessible to the genera

Scientific paper

10.1103/PhysRevLett.96.127602

Thin films of PbTiO3, a classical ferroelectric, have been grown under tensile strain on single-crystal substrates of DyScO3. The films, of only 5nm thickness, grow fully coherent with the substrate and show no crystallographic twin domains, as evidenced by synchrotron x-ray diffraction. A mapping of the reciprocal space reveals intensity modulations (satellites) due to regularly-spaced polar domains in which the polarization appears rotated away from the substrate normal, characterizing a low symmetry phase not observed in the bulk material. This could have important practical implications since these phases are known to be responsible for ultrahigh piezoelectric responses in complex systems.

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