Competing conduction mechanisms for two-dimensional electron gas at LaTiO3/SrTiO3 heterointerfaces

被引：0

作者：

Leng, Huaqian ^{[1
]}

Xu, Kunyao ^{[1
]}

Tian, Hanyue ^{[1
]}

He, Yongheng ^{[1
]}

Zhao, Yan ^{[1
]}

Xu, Minghui ^{[1
]}

Yu, Xiaojiang ^{[2
]}

Breese, Mark B. H. ^{[2
,3
]}

Zhang, Hui ^{[4
]}

Liu, Zhengtai ^{[4
]}

Shen, Dawei ^{[5
]}

Wu, Xiaoqiang ^{[6
]}

Yi, Jiabao ^{[7
]}

Qiao, Liang ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Phys, Chengdu 610054, Peoples R China

[2] Natl Univ Singapore, Singapore Synchrotron Light Source SSLS, 5 Res Link, Singapore 117603, Singapore

[3] Natl Univ Singapore, Dept Phys, 2 Sci Dr 3, Singapore 117551, Singapore

[4] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201210, Peoples R China

[5] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China

[6] Chengdu Univ, Inst Adv Study, Chengdu, Peoples R China

[7] Univ Newcastle, Global Innovat Ctr Adv Nanomat, Sch Engn, Callaghan, NSW 2308, Australia

来源：

APPLIED PHYSICS LETTERS | 2024年 / 124卷 / 18期

基金：

新加坡国家研究基金会; 澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

OXIDE INTERFACES; SRTIO3; FILMS;

D O I：

10.1063/5.0202403

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In pursuit of understanding the mechanism of two-dimensional electron gas (2DEG), artificial heterostructures based on SrTiO3 have sparked a wealth of exciting experimental and theoretical results. However, to date, the physical origin of this phenomenon still remains controversial. In our endeavor to unravel the mystery, we have synthesized a series of LaTiO3+delta/SrTiO3 films by controlling growth temperature and oxygen pressure, respectively. X-ray absorption results identify the transition of Ti ions from Ti3+ to Ti4+. It is proved that electrical transport properties in the LaTiO3/SrTiO3 film are dominated by oxygen vacancies in SrTiO3. In addition, the metallic behavior observed in the amorphous LaTiO3/SrTiO3 film suggests contributions from growth-induced donor defects to 2DEG. Our work presents direct evidence of competing conduction mechanisms for the observed 2DEG at the LaTiO3/SrTiO3 interface and highlights the important role of oxygen diffusion from the substrate SrTiO3. Meanwhile, we emphasize the significance of LaTiO3 as an oxygen scale meter to investigate interfacial properties of oxide heterostructures.

引用

页数：7

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