中国物理B ›› 2023, Vol. 32 ›› Issue (2): 27103-027103.doi: 10.1088/1674-1056/ac9e96

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Magnetic ground state of plutonium dioxide: DFT+U calculations

Yue-Fei Hou(侯跃飞)1, Wei Jiang(江伟)1, Shu-Jing Li(李淑静)2, Zhen-Guo Fu(付振国)1, and Ping Zhang(张平)1,3,†   

  1. 1 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    2 Beijing University of Chemical Technology, Beijing 100029, China;
    3 School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China
  • 收稿日期:2022-08-23 修回日期:2022-10-28 接受日期:2022-10-31 出版日期:2023-01-10 发布日期:2023-02-07
  • 通讯作者: Ping Zhang E-mail:zhang_ping@iapcm.ac.cn
  • 基金资助:
    Project supported by National Natural Science Foundation of China, (Grant No. 12104034).

Magnetic ground state of plutonium dioxide: DFT+U calculations

Yue-Fei Hou(侯跃飞)1, Wei Jiang(江伟)1, Shu-Jing Li(李淑静)2, Zhen-Guo Fu(付振国)1, and Ping Zhang(张平)1,3,†   

  1. 1 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    2 Beijing University of Chemical Technology, Beijing 100029, China;
    3 School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China
  • Received:2022-08-23 Revised:2022-10-28 Accepted:2022-10-31 Online:2023-01-10 Published:2023-02-07
  • Contact: Ping Zhang E-mail:zhang_ping@iapcm.ac.cn
  • Supported by:
    Project supported by National Natural Science Foundation of China, (Grant No. 12104034).

摘要: The magnetic states of the strongly correlated system plutonium dioxide (PuO$_{2}$) are studied based on the density functional theory (DFT) plus Hubbard $U$ (DFT$ + U$) method with spin-orbit coupling (SOC) included. A series of typical magnetic structures including the multiple-$k$ types are simulated and compared in the aspect of atomic structure and total energy. We test LDA, PBE, and SCAN exchange-correlation functionals on PuO$_{2}$ and a longitudinal $3k$ antiferromagnetic (AFM) ground state is theoretically determined. This magnetic structure has been identified to be the most stable one by the former computational work using the hybrid functional. Our DFT$ + U$$ + $SOC calculations for the longitudinal $3k$ AFM ground state suggest a direct gap which is in good agreement with the experimental value. In addition, a genetic algorithm is employed and proved to be effective in predicting magnetic ground state of PuO$_{2}$. Finally, a comparison between the results of two extensively used DFT$ + U$ approaches to this system is made.

关键词: strongly correlated system, magnetic ground state, noncollinear, MagGene

Abstract: The magnetic states of the strongly correlated system plutonium dioxide (PuO$_{2}$) are studied based on the density functional theory (DFT) plus Hubbard $U$ (DFT$ + U$) method with spin-orbit coupling (SOC) included. A series of typical magnetic structures including the multiple-$k$ types are simulated and compared in the aspect of atomic structure and total energy. We test LDA, PBE, and SCAN exchange-correlation functionals on PuO$_{2}$ and a longitudinal $3k$ antiferromagnetic (AFM) ground state is theoretically determined. This magnetic structure has been identified to be the most stable one by the former computational work using the hybrid functional. Our DFT$ + U$$ + $SOC calculations for the longitudinal $3k$ AFM ground state suggest a direct gap which is in good agreement with the experimental value. In addition, a genetic algorithm is employed and proved to be effective in predicting magnetic ground state of PuO$_{2}$. Finally, a comparison between the results of two extensively used DFT$ + U$ approaches to this system is made.

Key words: strongly correlated system, magnetic ground state, noncollinear, MagGene

中图分类号:  (Strongly correlated electron systems; heavy fermions)

  • 71.27.+a
71.15.Mb (Density functional theory, local density approximation, gradient and other corrections) 75.10.Dg (Crystal-field theory and spin Hamiltonians)