Soft modes of collective domain-wall vibrations in epitaxial ferroelectric thin films

Details Soft modes of collective domain-wall vibrations in epitaxial ferroelectric thin films Soft modes of collective domain-wall vibrations in epitaxial ferroelectric thin films

2000-12-28

arxiv.org/abs/cond-mat/0012494v1

Physical Review B, vol. 65, art. 174115 (2002)

Physics

Condensed Matter

Materials Science

6 pages, 3 figures

Scientific paper

10.1103/PhysRevB.65.174115

Mechanical restoring forces acting on ferroelastic domain walls displaced from the equilibrium positions in epitaxial films are calculated for various modes of their cooperative translational oscillations. For vibrations of the domain-wall superlattice with the wave vectors corresponding to the center and boundaries of the first Brillouin zone, the soft modes are singled out that are distinguished by a minimum magnitude of the restoring force. It is shown that, in polydomain ferroelectric thin films, the soft modes of wall vibrations may create enormously large contribution to the film permittivity.

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