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Magnetostriction and ferroelectric state in AgCrS₂.

Sergey V Streltsov1, Alexander I Poteryaev, Alexey N Rubtsov

  • 1M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620137, Ekaterinburg, Russia. Ural Federal University, Mira St. 19, 620002 Ekaterinburg, Russia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
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Magnetically ordered AgCrS2 exhibits lattice distortions due to magnetostriction, creating varied Cr-Cr bond lengths. This structural change induces spontaneous electric polarization in the material.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Magnetism

Background:

  • AgCrS2 is a material with potential magnetic and electric properties.
  • Understanding its behavior under magnetic ordering is crucial for materials design.

Purpose of the Study:

  • To investigate the structural and electronic properties of AgCrS2 in its magnetically ordered phase.
  • To elucidate the relationship between magnetic ordering, lattice distortions, and electric polarization.

Main Methods:

  • Band structure calculations using the GGA+U approximation.
  • Analysis of magnetostriction effects on atomic structure.

Main Results:

  • The GGA+U calculations reveal additional lattice distortions in the magnetically ordered AgCrS2.
  • Magnetostriction results in alternating long and short Cr-Cr bonds based on spin alignment.
  • Distortions of CrS6 octahedra accompany these bond changes.
  • Spontaneous electric polarization develops as a consequence of these structural modifications.

Conclusions:

  • Lattice distortions driven by magnetostriction are inherent to the magnetically ordered phase of AgCrS2.
  • These distortions are directly linked to the emergence of spontaneous electric polarization, indicating multiferroic potential.