Evidence for Strain-Induced Ferroelectric Order in Epitaxial Thin-Film KTaO3
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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Physical Review Letters, Volume 104, issue 22, pp. 1-4
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
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Tyunina, M, Narkilahti, J, Plekh, M, Oja, R, Nieminen, R M, Dejneka, A & Trepakov, V 2010, 'Evidence for Strain-Induced Ferroelectric Order in Epitaxial Thin-Film KTaO3', Physical Review Letters, vol. 104, no. 22, 227601, pp. 1-4. https://doi.org/10.1103/PhysRevLett.104.227601