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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2017-05-01
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Online Access: | https://doi.org/10.1038/s41598-017-02039-x |
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doaj-d33b43493c414e22b4b9b08fcf29b57c2020-12-08T03:19:02ZengNature Publishing GroupScientific Reports2045-23222017-05-01711710.1038/s41598-017-02039-xOff-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO3/SrTiO3Ming-Shiu Tsai0Chi-Sheng Li1Shih-Ting Guo2Ming-Yuan Song3Akhilesh Kr. Singh4Wei-Li Lee5M.-W. Chu6Institute of Physics, Academia SinicaInstitute of Physics, Academia SinicaInstitute of Physics, Academia SinicaInstitute of Physics, Academia SinicaInstitute of Physics, Academia SinicaInstitute of Physics, Academia SinicaCenter for Condensed Matter Sciences, National Taiwan UniversityAbstract 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.https://doi.org/10.1038/s41598-017-02039-x |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ming-Shiu Tsai Chi-Sheng Li Shih-Ting Guo Ming-Yuan Song Akhilesh Kr. Singh Wei-Li Lee M.-W. Chu |
spellingShingle |
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 Scientific Reports |
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 Publishing Group |
series |
Scientific Reports |
issn |
2045-2322 |
publishDate |
2017-05-01 |
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. |
url |
https://doi.org/10.1038/s41598-017-02039-x |
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