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Effects of La Doping and Zn or O Vacancy on the Magnetic Property of ZnO

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Abstract

Research on the magnetic origin and mechanism of La-doped ZnO system has been controversial. To solve this problem, we studied the effects of La doping and Zn or O vacancy on the magnetic property of ZnO using geometry optimization and energy calculation on the basis of first-principle generalized gradient approximation method of density functional theory. The electronic structures and magnetic properties of undoped ZnO, La-doped ZnO system, and systems with coexisting La doping and Zn or O vacancies were calculated. Results showed that the systems of La-doped ZnO and the coexistence of La doping and O vacancy are nonmagnetic. In addition, the system of La replacing Zn and one Zn vacancy exhibits long-range orderly ferromagnetism, and the Curie temperature of the doping system can achieve room temperature. The magnetism source of the systems with La doping and Zn vacancy coexisting in ZnO demonstrates strong hybrid coupling electron exchange effects existing among Zn-4s, Zn-3p, O-2p, and La-5s orbits that are nearest to the Zn vacancy. The next nearest distance between doping and Zn vacancy leads to the lowest formation energy and highest stability under the same doping condition.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61366008 and 61664007).

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Authors and Affiliations

  1. College of Science, Inner Mongolia University of Technology, Hohhot, 010051, China

    W. L. Li, Q. Y. Hou & X. F. Jia

  2. Inner Mongolia Key Laboratory of Thin Film and Coatings, Hohhot, 010051, China

    Q. Y. Hou

  3. College of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China

    Z. C. Xu

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  1. W. L. Li
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  2. Q. Y. Hou
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Correspondence to Q. Y. Hou.

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Li, W.L., Hou, Q.Y., Jia, X.F. et al. Effects of La Doping and Zn or O Vacancy on the Magnetic Property of ZnO. J Supercond Nov Magn 31, 3297–3305 (2018). https://doi.org/10.1007/s10948-018-4597-8

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  • DOI: https://doi.org/10.1007/s10948-018-4597-8

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