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Magnetic force theory combined with quasi-particle self-consistent GW method.

Hongkee Yoon1, Seung Woo Jang1, Jae-Hoon Sim1

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This study combines magnetic force theory with quasiparticle self-consistent GW method to analyze magnetic interactions. The new approach quantifies GW self-energy effects on magnetic properties in materials like 3d elements and transition-metal monoxides.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Investigating magnetic interactions in materials is crucial for technological applications.
  • Current methods struggle to quantify the impact of GW self-energy on magnetic phase differences.
  • Accurate theoretical predictions of magnetic properties are essential for materials design.

Purpose of the Study:

  • To develop and validate a combined theoretical framework for studying magnetic interactions.
  • To investigate the influence of quasiparticle self-consistent GW (QSGW) self-energy on magnetic properties.
  • To explore the electronic structure and magnetic coupling in various magnetic materials.

Main Methods:

  • Integration of magnetic force linear response theory with the QSGW method.
  • Utilizing self-consistently determined wavefunctions and eigenvalues for magnetic force calculations.
  • Performing orbital-dependent magnetic force calculations.

Main Results:

  • The combined method successfully quantifies GW self-energy effects on magnetic interactions.
  • In ferromagnetic 3d elements, QSGW slightly reduces d bandwidth and enhances interactions.
  • In antiferromagnetic transition-metal monoxides, QSGW significantly reduces interaction strengths by enlarging the electronic gap.
  • A large coupling between eg and 4s orbitals was identified in MnO.

Conclusions:

  • The combination of magnetic force theory and QSGW is a powerful tool for studying magnetic materials.
  • This approach provides new insights into the role of electronic correlations in magnetism.
  • The findings pave the way for designing novel magnetic materials with tailored properties.