Tuning the Structural, Electronic, and Magnetic Properties of Strontium Titanate Through Atomic Design: A Comparison Between Oxygen Vacancies and Nitrogen Doping

Authors

  • Xia-Xia Liao,

    1. Department of Physics, and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, China
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  • Hui-Qiong Wang,

    Corresponding author
    1. Fujian Key Lab of Semiconductor Materials and Applications, Xiamen University, Xiamen, China
    • Department of Physics, and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, China
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  • Jin-Cheng Zheng

    Corresponding author
    1. Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University, Xiamen, China
    • Department of Physics, and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, China
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Author to whom correspondence should be addressed. e-mails: hqwang@xmu.edu.cn and jczheng@xmu.edu.cn.

Abstract

The structural, electronic, and magnetic properties of seven sets of SrTiO2.75 (oxygen vacancies) and SrTiO2.75N0.25 (nitrogen doping) models were investigated by the first principles calculations based on density functional theory. Our results indicated that oxygen vacancies tended to align in a chain sandwiched with Ti atoms, whereas doped nitrogen atoms (substituting oxygen atoms in SrTiO3) preferred other arrangements rather than a chain. In addition, under stable arrangement, SrTiO2.75 showed no magnetism, whereas magnetic moments appeared in other meta-stable SrTiO2.75 configurations as well as in SrTiO2.75N0.25, which is attributed to the Ti 3d orbitals and nitrogen p orbitals, respectively. Our results suggest a possible route for tuning magnetic and electronic properties of SrTiO3 by atomic design.

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