Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO3

Abstract The interface between LaAlO3 (LAO) and SrTiO3 (STO) has attracted enormous interests due to its rich physical phenomena, such as metallic nature, magnetism and superconductivity. In this work, we report our experimental investigations on the influence of the LAO stoichiometry to the metalli...

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Autores principales:	Ming-Shiu Tsai, Chi-Sheng Li, Shih-Ting Guo, Ming-Yuan Song, Akhilesh Kr. Singh, Wei-Li Lee, M.-W. Chu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d33b43493c414e22b4b9b08fcf29b57c
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spelling	oai:doaj.org-article:d33b43493c414e22b4b9b08fcf29b57c2021-12-02T12:32:34ZOff-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO310.1038/s41598-017-02039-x2045-2322https://doaj.org/article/d33b43493c414e22b4b9b08fcf29b57c2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02039-xhttps://doaj.org/toc/2045-2322Abstract The interface between LaAlO3 (LAO) and SrTiO3 (STO) has attracted enormous interests due to its rich physical phenomena, such as metallic nature, magnetism and superconductivity. In this work, we report our experimental investigations on the influence of the LAO stoichiometry to the metallic interface. Taking advantage of the oxide molecular beam epitaxy (MBE) technique, a series of high quality LAO films with different nominal La/Al ratios and LAO thicknesses were grown on the TiO2-terminated STO substrates, where systematic variations of the LAO lattice constant and transport property were observed. In particular, the sheet density can be largely reduced by nearly an order of magnitude with merely about 20% increase in the nominal La/Al ratio. Our finding provides an effective method on tuning the electron density of the two-dimensional electron liquid (2DEL) at the LAO/STO interface.Ming-Shiu TsaiChi-Sheng LiShih-Ting GuoMing-Yuan SongAkhilesh Kr. SinghWei-Li LeeM.-W. ChuNature 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 Ming-Shiu Tsai Chi-Sheng Li Shih-Ting Guo Ming-Yuan Song Akhilesh Kr. Singh Wei-Li Lee M.-W. Chu Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO3
description	Abstract The interface between LaAlO3 (LAO) and SrTiO3 (STO) has attracted enormous interests due to its rich physical phenomena, such as metallic nature, magnetism and superconductivity. In this work, we report our experimental investigations on the influence of the LAO stoichiometry to the metallic interface. Taking advantage of the oxide molecular beam epitaxy (MBE) technique, a series of high quality LAO films with different nominal La/Al ratios and LAO thicknesses were grown on the TiO2-terminated STO substrates, where systematic variations of the LAO lattice constant and transport property were observed. In particular, the sheet density can be largely reduced by nearly an order of magnitude with merely about 20% increase in the nominal La/Al ratio. Our finding provides an effective method on tuning the electron density of the two-dimensional electron liquid (2DEL) at the LAO/STO interface.
format	article
author	Ming-Shiu Tsai Chi-Sheng Li Shih-Ting Guo Ming-Yuan Song Akhilesh Kr. Singh Wei-Li Lee M.-W. Chu
author_facet	Ming-Shiu Tsai Chi-Sheng Li Shih-Ting Guo Ming-Yuan Song Akhilesh Kr. Singh Wei-Li Lee M.-W. Chu
author_sort	Ming-Shiu Tsai
title	Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO3
title_short	Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO3
title_full	Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO3
title_fullStr	Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO3
title_full_unstemmed	Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO3
title_sort	off-stoichiometry driven carrier density variation at the interface of laalo3/srtio3
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d33b43493c414e22b4b9b08fcf29b57c
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Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO3

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