Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant

Abstract Ti2O3 exhibits unique metal–insulator transition (MIT) at ~ 450 K over a wide temperature range of ~ 150 K. The close relationship between MIT and crystal deformation has been proposed. However, as physical properties are governed by the thermodynamic equilibrium in bulk systems, conducting...

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Autores principales:	K. Yoshimatsu, N. Hasegawa, Y. Nambu, Y. Ishii, Y. Wakabayashi, H. Kumigashira
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/baa44c2bc7f342ff94ee9c4fcb8a871e
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spelling	oai:doaj.org-article:baa44c2bc7f342ff94ee9c4fcb8a871e2021-12-02T12:40:40ZMetallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant10.1038/s41598-020-79182-52045-2322https://doaj.org/article/baa44c2bc7f342ff94ee9c4fcb8a871e2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79182-5https://doaj.org/toc/2045-2322Abstract Ti2O3 exhibits unique metal–insulator transition (MIT) at ~ 450 K over a wide temperature range of ~ 150 K. The close relationship between MIT and crystal deformation has been proposed. However, as physical properties are governed by the thermodynamic equilibrium in bulk systems, conducting experimental studies under different lattice deformations remains challenging. Epitaxial thin films can offer high flexibility to accommodate adaptive crystal lattices and provide efficient platforms for investigating the MIT. In this study, we report the synthesis of corundum-type Ti2O3 films on various growth temperatures. We found that the metallic ground states appeared in the films grown at low temperatures. The electronic ground states were further investigated by the electronic-structure calculations. Results suggest that the electrical properties of Ti2O3 films were governed by the c/a ratio of the crystal structure, and the absence of the MIT was attributed to the lattice deformation characterized by an elongated c lattice constant.K. YoshimatsuN. HasegawaY. NambuY. IshiiY. WakabayashiH. KumigashiraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q K. Yoshimatsu N. Hasegawa Y. Nambu Y. Ishii Y. Wakabayashi H. Kumigashira Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant
description	Abstract Ti2O3 exhibits unique metal–insulator transition (MIT) at ~ 450 K over a wide temperature range of ~ 150 K. The close relationship between MIT and crystal deformation has been proposed. However, as physical properties are governed by the thermodynamic equilibrium in bulk systems, conducting experimental studies under different lattice deformations remains challenging. Epitaxial thin films can offer high flexibility to accommodate adaptive crystal lattices and provide efficient platforms for investigating the MIT. In this study, we report the synthesis of corundum-type Ti2O3 films on various growth temperatures. We found that the metallic ground states appeared in the films grown at low temperatures. The electronic ground states were further investigated by the electronic-structure calculations. Results suggest that the electrical properties of Ti2O3 films were governed by the c/a ratio of the crystal structure, and the absence of the MIT was attributed to the lattice deformation characterized by an elongated c lattice constant.
format	article
author	K. Yoshimatsu N. Hasegawa Y. Nambu Y. Ishii Y. Wakabayashi H. Kumigashira
author_facet	K. Yoshimatsu N. Hasegawa Y. Nambu Y. Ishii Y. Wakabayashi H. Kumigashira
author_sort	K. Yoshimatsu
title	Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant
title_short	Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant
title_full	Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant
title_fullStr	Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant
title_full_unstemmed	Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant
title_sort	metallic ground states of undoped ti2o3 films induced by elongated c-axis lattice constant
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/baa44c2bc7f342ff94ee9c4fcb8a871e
work_keys_str_mv	AT kyoshimatsu metallicgroundstatesofundopedti2o3filmsinducedbyelongatedcaxislatticeconstant AT nhasegawa metallicgroundstatesofundopedti2o3filmsinducedbyelongatedcaxislatticeconstant AT ynambu metallicgroundstatesofundopedti2o3filmsinducedbyelongatedcaxislatticeconstant AT yishii metallicgroundstatesofundopedti2o3filmsinducedbyelongatedcaxislatticeconstant AT ywakabayashi metallicgroundstatesofundopedti2o3filmsinducedbyelongatedcaxislatticeconstant AT hkumigashira metallicgroundstatesofundopedti2o3filmsinducedbyelongatedcaxislatticeconstant
_version_	1718393763331571712

Metallic ground states of undoped Ti2O3 films induced by elongated c-axis lattice constant

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