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A self-consistent approach to soft mode analysis in size driven ferroelectricity

✍ Scribed by Preeti Khare; Debanand Sa

Publisher: Elsevier Science
Year: 2011
Tongue: English
Weight: 258 KB
Volume: 406
Category: Article
ISSN: 0921-4526
DOI: 10.1016/j.physb.2011.04.011

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✦ Synopsis

The polarization distribution in a finite size system obtained through Landau phenomenology is shown to contain unphysical oscillatory parts [P. Khare, D. Sa, Solid State Commun. 150 (2010) 172]. Self-consistency in the solution has been used to remove such difficulty and the issue of soft mode in such system has been addressed. The temperature as well as the size dependence of the soft mode frequency is calculated and compared with the experiment. The extrapolation length for the size driven ferroelectricity is argued to behave in a way similar to that of correlation length in phase transition in bulk system.

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