Evidence for Strain-Induced Ferroelectric Order in Epitaxial Thin-Film KTaO3

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© 2010 American Physical Society (APS). This is the accepted version of the following article: Tyunina, M. & Narkilahti, J. & Plekh, M. & Oja, R. & Nieminen, Risto M. & Dejneka, A. & Trepakov, V. 2010. Evidence for Strain-Induced Ferroelectric Order in Epitaxial Thin-Film KTaO3. Physical Review Letters. Volume 104, Issue 22. 227601/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.104.227601, which has been published in final form at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.104.227601.
Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2010
Major/Subject
Mcode
Degree programme
Language
en
Pages
227601/1-4
Series
Physical Review Letters, Volume 104, Issue 22
Abstract
In perovskite-structure epitaxial films, it has been theoretically predicted that the polarization and the coherence of polar order can increase with increasing crystallographic strain. Experimental evidence of strain-induced long-range ferroelectric order has not been obtained thus far, posing the fundamental question of whether or not strain can induce the long-range polar order. Here we demonstrate the existence of strain-induced ferroelectric order in quantum paraelectric KTaO3 by combining experimental investigations of epitaxial KTaO3 films and density-functional-theory calculations. The long-range ferroelectric order does exist under a large enough epitaxial strain. We suggest that a region of short-range polar order might appear between paraelectric and ferroelectric states in the strain-temperature phase diagrams.
Description
Keywords
ferroelectricity, thin-films, perovskites, oxides
Other note
Citation
Tyunina, M. & Narkilahti, J. & Plekh, M. & Oja, R. & Nieminen, Risto M. & Dejneka, A. & Trepakov, V. 2010. Evidence for Strain-Induced Ferroelectric Order in Epitaxial Thin-Film KTaO3. Physical Review Letters. Volume 104, Issue 22. 227601/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.104.227601.