TITLE

Pseudoferroelectricity: A possible scenario for doped ZnO

AUTHOR(S)

Tagantsev, Alexander K.

PUB. DATE

November 2008

SOURCE

Applied Physics Letters;11/17/2008, Vol. 93 Issue 20, p202905

SOURCE TYPE

Academic Journal

DOC. TYPE

Article

ABSTRACT

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.

ACCESSION #

35514060

Tags: MAGNETIC induction;  HYSTERESIS loop;  DIELECTRICS;  ELECTROMAGNETISM;  MAGNETIC flux

 

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