Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures

Abstract The resistance of the electron gas (2DEG) at the interface between the two band insulators LaAlO3 (LAO) and SrTiO3 (STO) typically drops monotonically with temperature and R/T curves during cooling and warm-up look identical for large area structures. Here we show that if the LAO/STO is lat...

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Autores principales:	M. Z. Minhas, A. Müller, F. Heyroth, H. H. Blaschek, G. Schmidt
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8e53c54d9c6a45c6ad6a5ae4aab157b8
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spelling	oai:doaj.org-article:8e53c54d9c6a45c6ad6a5ae4aab157b82021-12-02T16:07:00ZTemperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures10.1038/s41598-017-05331-y2045-2322https://doaj.org/article/8e53c54d9c6a45c6ad6a5ae4aab157b82017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05331-yhttps://doaj.org/toc/2045-2322Abstract The resistance of the electron gas (2DEG) at the interface between the two band insulators LaAlO3 (LAO) and SrTiO3 (STO) typically drops monotonically with temperature and R/T curves during cooling and warm-up look identical for large area structures. Here we show that if the LAO/STO is laterally restricted by nanopatterning the resistance exhibits a temperature anomaly. Warming up nanostructures from low temperatures leads to one or two pronounced resistance peaks between 50 and 100 K not observed for larger dimensions. During cool-down current filaments emerge at the domain walls that form during a structural phase transition of the STO substrate. During warm-up the reverse phase transition can interrupt filaments before the sheet conductivity which dominates at higher temperature is reestablished. Due to the limited number of filaments in a nanostructure this process can result in a complete loss of conductance. As a consequence of these findings the transport physics extracted from experiments in small and large area LAO/STO structures may need to be reconsidered.M. Z. MinhasA. MüllerF. HeyrothH. H. BlaschekG. SchmidtNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. Z. Minhas A. Müller F. Heyroth H. H. Blaschek G. Schmidt Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures
description	Abstract The resistance of the electron gas (2DEG) at the interface between the two band insulators LaAlO3 (LAO) and SrTiO3 (STO) typically drops monotonically with temperature and R/T curves during cooling and warm-up look identical for large area structures. Here we show that if the LAO/STO is laterally restricted by nanopatterning the resistance exhibits a temperature anomaly. Warming up nanostructures from low temperatures leads to one or two pronounced resistance peaks between 50 and 100 K not observed for larger dimensions. During cool-down current filaments emerge at the domain walls that form during a structural phase transition of the STO substrate. During warm-up the reverse phase transition can interrupt filaments before the sheet conductivity which dominates at higher temperature is reestablished. Due to the limited number of filaments in a nanostructure this process can result in a complete loss of conductance. As a consequence of these findings the transport physics extracted from experiments in small and large area LAO/STO structures may need to be reconsidered.
format	article
author	M. Z. Minhas A. Müller F. Heyroth H. H. Blaschek G. Schmidt
author_facet	M. Z. Minhas A. Müller F. Heyroth H. H. Blaschek G. Schmidt
author_sort	M. Z. Minhas
title	Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures
title_short	Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures
title_full	Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures
title_fullStr	Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures
title_full_unstemmed	Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures
title_sort	temperature dependent giant resistance anomaly in laalo3/srtio3 nanostructures
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/8e53c54d9c6a45c6ad6a5ae4aab157b8
work_keys_str_mv	AT mzminhas temperaturedependentgiantresistanceanomalyinlaalo3srtio3nanostructures AT amuller temperaturedependentgiantresistanceanomalyinlaalo3srtio3nanostructures AT fheyroth temperaturedependentgiantresistanceanomalyinlaalo3srtio3nanostructures AT hhblaschek temperaturedependentgiantresistanceanomalyinlaalo3srtio3nanostructures AT gschmidt temperaturedependentgiantresistanceanomalyinlaalo3srtio3nanostructures
_version_	1718384789521694720

Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures

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