Abstract
Based on the density functional theory, we investigate the electronic and magnetic properties of various types of defect complexes formed by dopant Tm and Ga vacancies, N vacancies, or O interstitial in Tm-doped GaN. Formation energies are first calculated for all defect complexes to assess their stability. The single Tm dopant is found to introduce the local magnetic moment of about 2 μB/Tm in GaN. However, in the case of defect complexes, the magnetic moments of Tm can be suppressed by the existence of Ga vacancies around it, while the presence of N vacancies or O interstitial does not influence the magnetic moment of Tm. In addition, each Ga vacancy in the neutral charge state induces the local magnetic moment of about 2.1 μB and one octahedral O interstitial can lead to the local moment of about 1.6 μB.
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This work is supported by the Scientific Research Project of Hebei Province High Level Talents in Colleges and Universities, China (Grant No. GCC2014023).
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Li, Y.R., Su, H.L., Hou, Z.T. et al. Effect of Intrinsic Defects on Electronic and Magnetic Properties in Tm-Doped GaN: First-Principles Calculations. J Supercond Nov Magn 31, 3911–3917 (2018). https://doi.org/10.1007/s10948-018-4654-3
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DOI: https://doi.org/10.1007/s10948-018-4654-3