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Spin phonon coupling in hexagonal multiferroic YMnO3.

S Petit1, F Moussa, M Hennion

  • 1Laboratoire Léon Brillouin, CEA-CNRS, CE-SACLAY, F-91191 Gif sur Yvette, France.

Physical Review Letters
|February 1, 2008
PubMed
Summary
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Inelastic neutron scattering reveals strong coupling between magnons and phonons in YMnO3. This interaction causes a phonon gap and hybridization, impacting the hexagonal multiferroic material.

Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Yttrium Manganite (YMnO3) is a hexagonal multiferroic material.
  • Understanding the interplay between magnetic (spin) and lattice (phonon) excitations is crucial for multiferroic properties.

Purpose of the Study:

  • Investigate the coupling between spin and lattice degrees of freedom in YMnO3.
  • Characterize the behavior of magnons and phonons in this material.

Main Methods:

  • Performed inelastic neutron scattering measurements.
  • Analyzed phonon and magnon dispersions.

Main Results:

  • Observed strong coupling between magnons and phonons.
  • Evidence of a gap opening in the transverse acoustic phonon mode below the Néel temperature (T(N)).

Related Experiment Videos

  • The upper phonon branch locks onto a spin-wave mode, indicating hybridization.

    • Conclusions:

    • The findings suggest a significant hybridization between magnons and phonons in YMnO3.
    • This coupling influences the material's multiferroic behavior.