Enhanced mobility in LaAlO3/SrTiO3 heterostructures with layer-modulated patterning

Hu, Hai-Long and Pham, Anh and Chen, Zhigang and Duty, Timothy and Wang, Danyang and Li, Sean (2019) Enhanced mobility in LaAlO3/SrTiO3 heterostructures with layer-modulated patterning. Ceramics International, 45 (5). pp. 5496-5502. ISSN 0272-8842


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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials
Date Deposited: 10 Jun 2019 04:44
Last Modified: 18 Jun 2019 04:47
Uncontrolled Keywords: heterostructures; electronic properties; oxide electronics
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Funding Details:
Identification Number or DOI: 10.1016/j.ceramint.2018.12.006
URI: http://eprints.usq.edu.au/id/eprint/36048

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