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research article
Pseudoferroelectricity: A possible scenario for doped ZnO
Tagantsev, A.K.
A phenomenological Landau-theory model, where a crystal on cooling from a state with polar symmetry exhibits a maximum of dielectric permittivity and polarization-field hysteresis loops, is offered. The model is equivalent to that of a true ferroelectric in a weak external dc bias. Permittivity maximum occurs as a result of crossing the Widom line. In the model, the role of the external bias plays an intrinsic internal bias originating from a weak polarity of the high temperature state of the material. The results obtained show that the ferroelectriclike phenomena reported for doped ZnO are compatible with a Landau-theory description.
Type
research article
Web of Science ID
WOS:000261141400043
Authors
Tagantsev, A.K.
Publication date
2008
Published in
Volume
93
Issue
20
Article Number
202905
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
June 25, 2009
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