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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Altermagnets are a class of collinear compensated magnets.
  • A key predicted property of altermagnets is the presence of split chiral magnon modes.
  • These modes were recently theorized to exist in manganese difluoride (MnF2).

Purpose of the Study:

  • To experimentally verify the existence of predicted split chiral magnon modes in MnF2.
  • To investigate the spin dynamics of MnF2 using inelastic neutron scattering.

Main Methods:

  • Inelastic neutron scattering experiments were performed on a single crystal of MnF2.
  • Measurements were conducted along high-symmetry paths in the Brillouin zone where magnon splitting was expected.
  • The resulting inelastic spectrum was modeled using various magnetic exchange interactions and anisotropy.

Main Results:

  • No observable splitting of magnon modes was detected within the experimental resolution.
  • The spin dynamics were accurately modeled by J1, J2, J3 nearest-neighbor exchange interactions and weak uniaxial anisotropy.
  • These dominant interactions possess higher symmetry than the crystal lattice, and altermagnetic splitting interactions were found to be negligible.

Conclusions:

  • The spin dynamics of MnF2 are indistinguishable from a classical Néel antiferromagnet, with degenerate magnon modes across the Brillouin zone.
  • While altermagnetic symmetry may allow chiral magnon modes, their splitting in MnF2 is negligibly small.
  • A magnetic field induces Zeeman splitting of magnon modes near the Γ point, but this differs from the predicted altermagnetic splitting.