Journal
NANOSCALE
Volume 14, Issue 27, Pages 9771-9780Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nr01884e
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Funding
- National Natural Science Foundation of China [51572222]
- Key Research Project of the Natural Science Foundation of Shaanxi Province, China [2021JZ-08, 2020JM-088]
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Chemical doping is a dominant method for manipulating oxide two-dimensional electron gas (2DEG). However, maintaining metallic conduction while enhancing the doping level remains challenging. In this study, a concept of high-entropy heterointerface is proposed and high-entropy heterointerfaces with different thicknesses and doping ratios are successfully fabricated. The results demonstrate the potential of this strategy to tailor 2DEG in all-oxide interfaces while maintaining its conductivity.
Chemical doping is a dominating method for manipulating oxide two-dimensional electron gas (2DEG). However, enhancing the doping level while maintaining the metallic conduction remains a challenge, which limits detailed knowledge of 2DEG manipulation. Herein, we propose a concept of high-entropy heterointerface, which consists of a complex oxide (containing at least 5 elements) at either or both sides of the interface. By doubly doping Sr and Mn elements in the Nd and Al sites of NdAlO3, we grow Nd1-xSrxAl1-xMnxO3 (NSAMO) films onto SrTiO3 (STO) substrates to fabricate NSAMO/STO high-entropy heterointerfaces with different thicknesses (2-30 nm) and a wide range of doping ratios x (0.14-0.56). The 2DEG conducting behavior is maintained until x = 0.42, which is higher compared with similar studies. The varying x results in the coexistence of rich properties like a weak anti-localization (0.14-0.42), abnormal Hall effect (0.28 & 0.42), Lifshitz transition (0.42) and stable structure. These results confirm the potential of this strategy to tailor 2DEG in all-oxide interfaces.
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