journal article·2017-06-01Open access

δ-Doping of oxygen vacancies dictated by thermodynamics in epitaxial SrTiO3 films

Fengmiao Li, Fang Yang, Yan Liang, Shanming Li, Zhenzhong Yang, Qinghua Zhang, Wentao Li, Xuetao Zhu, Lin Gu, Jiandi Zhang, E. W. Plummer, Jiandong Guo

AIP Advances· Volume 7· Issue 6

Abstract

Homoepitaxial SrTiO3(110) film is grown by molecular beam epitaxy in ultra-high vacuum with oxygen diffusing from substrate as the only oxidant. The resulted oxygen vacancies (VOs) are found to be spatially confined within few subsurface layers only, forming a quasi-two-dimensional doped region with a tunable high concentration. Such a δ-function distribution of VOs is essentially determined by the thermodynamics associated with the surface reconstruction, and facilitated by the relatively high growth temperature. Our results demonstrate that it is feasible to tune VOs distribution at the atomic scale by controlling the lattice structure of oxide surfaces.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences 1 , Beijing 100190, People’s Republic of China

Stewart Blusson Quantum Matter Institute, Department of Physics and Astronomy, University of British Columbia 2 , Vancouver V6T 1Z1, Canada

Department of Physics and Astronomy, Louisiana State University 3 , Baton Rouge, Louisiana 70803, USA

Collaborative Innovation Center of Quantum Matter 4 , Beijing 100871, People’s Republic of China

School of Physical Sciences, University of Chinese Academy of Sciences 5 , Beijing 100190, People’s Republic of China

Funding

National Natural Science Foundation of China · Chinese Academy of Sciences · Ministry of Science and Technology of the People's Republic of China

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