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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Online Access: | https://doi.org/10.1038/s41598-017-05331-y |
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doaj-8e53c54d9c6a45c6ad6a5ae4aab157b82020-12-08T01:05:45ZengNature Publishing GroupScientific Reports2045-23222017-07-01711910.1038/s41598-017-05331-yTemperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructuresM. Z. Minhas0A. Müller1F. Heyroth2H. H. Blaschek3G. Schmidt4Institut für Physik, Martin-Luther-Universität Halle-WittenbergInstitut für Physik, Martin-Luther-Universität Halle-WittenbergInterdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-WittenbergInstitut für Physik, Martin-Luther-Universität Halle-WittenbergInstitut für Physik, Martin-Luther-Universität Halle-WittenbergAbstract 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.https://doi.org/10.1038/s41598-017-05331-y |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
M. Z. Minhas A. Müller F. Heyroth H. H. Blaschek G. Schmidt |
spellingShingle |
M. Z. Minhas A. Müller F. Heyroth H. H. Blaschek G. Schmidt Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures Scientific Reports |
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 Publishing Group |
series |
Scientific Reports |
issn |
2045-2322 |
publishDate |
2017-07-01 |
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. |
url |
https://doi.org/10.1038/s41598-017-05331-y |
work_keys_str_mv |
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