Hlinka, J., Ostapchuk, T., Noujni, D. et al. (2 more authors) (2006) Anisotropic dielectric function in polar nanoregions of relaxor ferroelectrics. Physical Review Letters , 96 (2). 027601. ISSN 0031-9007
Abstract
The Letter suggests treating the infrared reflectivity spectra of single crystal perovskite relaxors as fine-grained ferroelectric ceramics: locally frozen polarization makes the dielectric function strongly anisotropic in the phonon frequency range and the random orientation of the polarization at nanoscopic scale requires taking into account the inhomogeneous depolarization field. Employing a simple effective medium approximation (the Bruggeman symmetrical formula) turns out to be sufficient for reproducing all principal features of room temperature reflectivity of Pb ( Mg 1 / 3 Nb 2 / 3 ) O 3 . One of the reflectivity bands is identified as a geometrical resonance entirely related to the nanoscale polarization inhomogeneity. The approach provides a general guide for systematic determination of the polar mode frequencies split by the inhomogeneous polarization at the nanometer scale.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2006 The American Physical Society. This is an author produced version of a paper subsequently published in Physical Review Letters. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 25 Aug 2017 12:11 |
Last Modified: | 28 Mar 2018 20:30 |
Published Version: | https://doi.org/10.1103/PhysRevLett.96.027601 |
Status: | Published |
Publisher: | American Physical Society |
Identification Number: | 10.1103/PhysRevLett.96.027601 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:120578 |