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research article
Susceptibility anomaly in films with bilinear coupling between order parameter and strain
The dielectric response of a ferroelectric film with bilinear coupling between order parameter and strain is theoretically addressed. An exact solution for the total (lattice and domain contributions) dielectric permittivity of the system for the case where the domain spacing is much smaller than of film thickness is reported. An unusual temperature dependence of the permittivity in the polydomain state is found: it stays constant below the phase transition. The treated problem has been found to be a remarkable case where the choice of the order parameter between two linearly coupled variables is crucial.
Type
research article
Web of Science ID
WOS:000230092000065
Authors
Publication date
2005
Published in
Volume
94
Issue
24
Article Number
247603
Subjects
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
August 21, 2006
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