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Altermagnetism, a new magnetic class, shows alternating spin polarization. Researchers observed this magnon splitting in α-MnTe using neutron scattering, confirming chiral splitting and g-wave magnetism.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Altermagnetism is a novel magnetic state characterized by alternating spin polarization in real and reciprocal space.
  • Theoretical predictions suggest that altermagnets should exhibit alternating chiral splitting in their magnon bands, analogous to electronic band splitting.

Purpose of the Study:

  • To experimentally verify the predicted alternating chiral splitting of magnon bands in altermagnets.
  • To investigate the underlying physical mechanisms responsible for the observed magnon splitting.
  • To identify other magnetic properties present in the studied material, MnTe.

Main Methods:

  • Inelastic neutron scattering experiments were conducted on α-MnTe to probe magnon excitations.
  • Analysis of the scattering data allowed for the direct observation of magnon band splitting.
  • A spin-wave model was developed and utilized for further theoretical calculations.

Main Results:

  • Direct experimental evidence of altermagnetic magnon splitting was observed in α-MnTe.
  • The lifted degeneracy of magnons was successfully explained by a symmetric-exchange interaction.
  • Calculations confirmed that the magnons exhibit chiral splitting, consistent with altermagnetic theory.
  • The presence of g-wave magnetism in MnTe was experimentally identified.

Conclusions:

  • The study provides the first direct experimental observation of altermagnetic magnon splitting.
  • The findings validate theoretical predictions of chiral splitting in altermagnetic magnon bands.
  • The identification of g-wave magnetism in MnTe further characterizes its unique magnetic properties.