Polar metal phase stabilized in strained La-doped BaTiO3films

Abstract Ferroelectric polarization and metallic conduction are two seemingly irreconcilable properties that cannot normally coexist in a single system, as the latter tends to screen the former. Polar metals, however, defy this rule and have thus attracted considerable attention as a new class of fe...

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Autores principales:	K. S. Takahashi, Y. Matsubara, M. S. Bahramy, N. Ogawa, D. Hashizume, Y. Tokura, M. Kawasaki
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bdba5530dbd5442e83c31e2e8c546187
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spelling	oai:doaj.org-article:bdba5530dbd5442e83c31e2e8c5461872021-12-02T16:08:21ZPolar metal phase stabilized in strained La-doped BaTiO3films10.1038/s41598-017-04635-32045-2322https://doaj.org/article/bdba5530dbd5442e83c31e2e8c5461872017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04635-3https://doaj.org/toc/2045-2322Abstract Ferroelectric polarization and metallic conduction are two seemingly irreconcilable properties that cannot normally coexist in a single system, as the latter tends to screen the former. Polar metals, however, defy this rule and have thus attracted considerable attention as a new class of ferroelectrics exhibiting novel properties. Here, we fabricate a new polar metal film based on the typical ferroelectric material BaTiO3by combining chemical doping and epitaxial strain induced by a substrate. The temperature dependences of the c-axis lattice constant and the second harmonic generation intensity of La-doped BaTiO3films indicate the existence of polar transitions. In addition, through La doping, films become metallic at the polar phase, and metallicity enhancement at the polar state occurs in low-La-doped films. This intriguing behaviour is effectively explained by our first-principles calculations. Our demonstration suggests that the carrier doping to ferroelectric material with epitaxial strain serves as a new way to explore polar metals.K. S. TakahashiY. MatsubaraM. S. BahramyN. OgawaD. HashizumeY. TokuraM. KawasakiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q K. S. Takahashi Y. Matsubara M. S. Bahramy N. Ogawa D. Hashizume Y. Tokura M. Kawasaki Polar metal phase stabilized in strained La-doped BaTiO3films
description	Abstract Ferroelectric polarization and metallic conduction are two seemingly irreconcilable properties that cannot normally coexist in a single system, as the latter tends to screen the former. Polar metals, however, defy this rule and have thus attracted considerable attention as a new class of ferroelectrics exhibiting novel properties. Here, we fabricate a new polar metal film based on the typical ferroelectric material BaTiO3by combining chemical doping and epitaxial strain induced by a substrate. The temperature dependences of the c-axis lattice constant and the second harmonic generation intensity of La-doped BaTiO3films indicate the existence of polar transitions. In addition, through La doping, films become metallic at the polar phase, and metallicity enhancement at the polar state occurs in low-La-doped films. This intriguing behaviour is effectively explained by our first-principles calculations. Our demonstration suggests that the carrier doping to ferroelectric material with epitaxial strain serves as a new way to explore polar metals.
format	article
author	K. S. Takahashi Y. Matsubara M. S. Bahramy N. Ogawa D. Hashizume Y. Tokura M. Kawasaki
author_facet	K. S. Takahashi Y. Matsubara M. S. Bahramy N. Ogawa D. Hashizume Y. Tokura M. Kawasaki
author_sort	K. S. Takahashi
title	Polar metal phase stabilized in strained La-doped BaTiO3films
title_short	Polar metal phase stabilized in strained La-doped BaTiO3films
title_full	Polar metal phase stabilized in strained La-doped BaTiO3films
title_fullStr	Polar metal phase stabilized in strained La-doped BaTiO3films
title_full_unstemmed	Polar metal phase stabilized in strained La-doped BaTiO3films
title_sort	polar metal phase stabilized in strained la-doped batio3films
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/bdba5530dbd5442e83c31e2e8c546187
work_keys_str_mv	AT kstakahashi polarmetalphasestabilizedinstrainedladopedbatio3films AT ymatsubara polarmetalphasestabilizedinstrainedladopedbatio3films AT msbahramy polarmetalphasestabilizedinstrainedladopedbatio3films AT nogawa polarmetalphasestabilizedinstrainedladopedbatio3films AT dhashizume polarmetalphasestabilizedinstrainedladopedbatio3films AT ytokura polarmetalphasestabilizedinstrainedladopedbatio3films AT mkawasaki polarmetalphasestabilizedinstrainedladopedbatio3films
_version_	1718384556047859712

Polar metal phase stabilized in strained La-doped BaTiO3films

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