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Martin-Luther-Universität
Interdisziplinäres Zentrum für Materialwissenschaften
Nanotechnikum Weinberg
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Abstracts

M. Z. Minhas, A. Müller, F. Heyroth, H. H. Blaschek & G. Schmidt
Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures
Scientific Reports 7 (2017),

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.

DOI 10.1038/s41598-017-05331-y


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