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Phonon and magnetic structure in δ-plutonium from density-functional theory.

Per Söderlind1, F Zhou1, A Landa1

  • 1Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.

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|October 31, 2015
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Summary

We calculated phonon properties of plutonium using advanced computational methods. Our results show improved agreement with experimental data, advancing the understanding of plutonium

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Area of Science:

  • Solid State Physics
  • Computational Materials Science
  • Quantum Mechanics

Background:

  • Understanding plutonium's physical properties is crucial for nuclear applications.
  • Accurate phonon properties are essential for predicting material behavior.
  • Previous theoretical models for plutonium have limitations.

Purpose of the Study:

  • To calculate phonon properties of plutonium metal with high accuracy.
  • To validate theoretical models against experimental data.
  • To investigate the role of magnetism in plutonium's properties.

Main Methods:

  • Density-Functional Theory (DFT) for electronic structure calculations.
  • Compressive Sensing Lattice Dynamics (CSLD) for phonon property prediction.
  • Modeling disordered magnetic moments with relativistic effects and orbital correlations.

Main Results:

  • Calculated phonon dispersions show improved agreement with experimental results compared to previous methods.
  • The theoretical model accurately predicts the magnetic form factor, validated by neutron-scattering experiments.
  • The study provides a robust framework for calculating phonon properties of strongly correlated materials.

Conclusions:

  • The combination of DFT and CSLD offers a powerful approach for predicting plutonium's phonon properties.
  • The inclusion of disordered magnetism and relativistic effects is critical for accurate modeling.
  • This work advances the understanding of plutonium's fundamental physical characteristics.