Enhanced mobility in LaAlO3/SrTiO3 heterostructures with layer-modulated patterning
Article
Article Title | Enhanced mobility in LaAlO3/SrTiO3 heterostructures with layer-modulated patterning |
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ERA Journal ID | 4877 |
Article Category | Article |
Authors | Hu, Hai-Long (Author), Pham, Anh (Author), Chen, Zhigang (Author), Duty, Timothy (Author), Wang, Danyang (Author) and Li, Sean (Author) |
Journal Title | Ceramics International |
Journal Citation | 45 (5), pp. 5496-5502 |
Number of Pages | 7 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0272-8842 |
1873-3956 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.ceramint.2018.12.006 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S027288421833373X |
Abstract | Overcoming the unintentional doping of defect-related carriers induced from low oxygen partial pressure is a major challenge to realize multifunctional oxide electronics. In this work, we demonstrate that the two-step deposition in conjunction with layer modulated patterning process can enhance several properties of LaAlO3/SrTiO3 (LAO/STO) heterostructures grown under a low oxygen partial pressure of 5 × 10−8 Torr. Specifically, our patterned samples exhibit extraordinary electronic properties including positive colossal magnetoresistance of ∼3500% under 10 T, and enhanced carrier mobility ~5000 cm2/Vs at 2 K without using buffer layer or using additional elements. These unique phenomena are resulted from inhibition of the multiband conducting behaviour, which likely originates from oxygen vacancy related defects in the STO layers, through the two-step fabrication method. Consequently, by controlling defect behaviour through the two-step deposition jointly with modulated patterning process, several properties for oxide-based electronics can be induced in a single platform even under a low oxygen condition. |
Keywords | heterostructures; electronic properties; oxide electronics |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of New South Wales |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) |
https://research.usq.edu.au/item/q5265/enhanced-mobility-in-laalo3-srtio3-heterostructures-with-layer-modulated-patterning
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