Surface state on first-order ferroelectrics

In the presence of a surface the Landau-Devonshire equations of ferroelectricity must be extended to include a boundary condition. For a ferroelectric with a second-order transition in the case when the polarization p(z) increases at the surface, it is well known that a surface state occurs in a ran...

Full description

Saved in:
Bibliographic Details
Main Authors: Chew, Khian Hooi, Halif, M.N.A., Osman, J., Tilley, D.R., Teh, R., Ishibashi, Y.
Format: Article
Published: 2006
Subjects:
Online Access:http://eprints.um.edu.my/8221/
http://link.springer.com/content/pdf/10.1140%2Fepjb%2Fe2006-00271-1.pdf
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Universiti Malaya
id my.um.eprints.8221
record_format eprints
spelling my.um.eprints.82212019-08-27T07:25:26Z http://eprints.um.edu.my/8221/ Surface state on first-order ferroelectrics Chew, Khian Hooi Halif, M.N.A. Osman, J. Tilley, D.R. Teh, R. Ishibashi, Y. QC Physics In the presence of a surface the Landau-Devonshire equations of ferroelectricity must be extended to include a boundary condition. For a ferroelectric with a second-order transition in the case when the polarization p(z) increases at the surface, it is well known that a surface state occurs in a range of temperature above the bulk critical temperature t(CB) . Here we explore the corresponding effect for a first-order ferroelectric. We show that a surface state can occur, but only if the surface effect is sufficiently strong. Analytic expressions are derived and illustrated for p(z), the surface value p(S) =p(0) and the free energy. The transition from the paraelectric state (p=0) to the surface state is first order, and for completeness we establish the dependence of the three critical temperatures (supercooling, thermodynamic and superheating) on a boundary-condition parameter y. In a final section, we derive and illustrate expressions for p(z)in the temperature range t < t(CB) . 2006 Article PeerReviewed Chew, Khian Hooi and Halif, M.N.A. and Osman, J. and Tilley, D.R. and Teh, R. and Ishibashi, Y. (2006) Surface state on first-order ferroelectrics. European Physical Journal B, 52 (1). pp. 143-150. ISSN 1434-6028 http://link.springer.com/content/pdf/10.1140%2Fepjb%2Fe2006-00271-1.pdf 10.1140/epjb/e2006-00271-1
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QC Physics
spellingShingle QC Physics
Chew, Khian Hooi
Halif, M.N.A.
Osman, J.
Tilley, D.R.
Teh, R.
Ishibashi, Y.
Surface state on first-order ferroelectrics
description In the presence of a surface the Landau-Devonshire equations of ferroelectricity must be extended to include a boundary condition. For a ferroelectric with a second-order transition in the case when the polarization p(z) increases at the surface, it is well known that a surface state occurs in a range of temperature above the bulk critical temperature t(CB) . Here we explore the corresponding effect for a first-order ferroelectric. We show that a surface state can occur, but only if the surface effect is sufficiently strong. Analytic expressions are derived and illustrated for p(z), the surface value p(S) =p(0) and the free energy. The transition from the paraelectric state (p=0) to the surface state is first order, and for completeness we establish the dependence of the three critical temperatures (supercooling, thermodynamic and superheating) on a boundary-condition parameter y. In a final section, we derive and illustrate expressions for p(z)in the temperature range t < t(CB) .
format Article
author Chew, Khian Hooi
Halif, M.N.A.
Osman, J.
Tilley, D.R.
Teh, R.
Ishibashi, Y.
author_facet Chew, Khian Hooi
Halif, M.N.A.
Osman, J.
Tilley, D.R.
Teh, R.
Ishibashi, Y.
author_sort Chew, Khian Hooi
title Surface state on first-order ferroelectrics
title_short Surface state on first-order ferroelectrics
title_full Surface state on first-order ferroelectrics
title_fullStr Surface state on first-order ferroelectrics
title_full_unstemmed Surface state on first-order ferroelectrics
title_sort surface state on first-order ferroelectrics
publishDate 2006
url http://eprints.um.edu.my/8221/
http://link.springer.com/content/pdf/10.1140%2Fepjb%2Fe2006-00271-1.pdf
_version_ 1643688251025784832