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Electron correlation effect versus spin-orbit coupling for tungsten and impurities.

Qingguo Feng1

  • 1Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 17, 2020
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Summary

Electron correlation and spin-orbit coupling (SOC) significantly impact tungsten

Keywords:
electron correlationfirst principlesimpuritymigrationspin–orbit couplingtungsten

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Computational materials science

Background:

  • Tungsten's unique properties are crucial for advanced applications.
  • Understanding defect behavior in tungsten is vital for material stability.
  • Electron correlation and spin-orbit coupling (SOC) are key factors influencing material properties.

Purpose of the Study:

  • Investigate the effects of electron correlation and SOC on tungsten's electronic structure and defect formation.
  • Analyze the influence of these effects on defect stability and migration barriers.
  • Provide insights for validating and improving studies on irradiative defects in tungsten.

Main Methods:

  • Utilized first-principles calculations based on density functional theory (DFT).
  • Examined body-centered-cubic tungsten with intrinsic and irradiative impurities.
  • Calculated band structures, defect formation energies, and migration barriers.

Main Results:

  • Electron correlation and SOC significantly alter tungsten's band structures and defect formation energies.
  • Electron correlation consistently enhances defect stability compared to standard DFT approximations.
  • SOC shows diverse effects on different defects, while its influence on vacancy migration is negligible.
  • Electron correlation notably reduces the migration barrier of single tungsten vacancies.

Conclusions:

  • Electron correlation and SOC are critical for accurately modeling tungsten's electronic properties and defect behavior.
  • The findings refine the understanding of defect stability and dynamics in tungsten.
  • This work offers a foundation for more accurate simulations of irradiated tungsten materials.