Spin-wave induced phonon resonance in multiferroic BiFeO$_3$
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Spin-wave induced phonon resonance in multiferroic BiFeO$_3$

  • Author(s): Xu, Z
  • Schneeloch, JA
  • Wen, J
  • Matsuda, M
  • Pajerowski, D
  • Winn, BL
  • Zhao, Y
  • Stock, C
  • Gehring, PM
  • Ushiyama, T
  • Yanagisawa, Y
  • Tomioka, Y
  • Ito, T
  • Gu, G
  • Birgeneau, RJ
  • Xu, G
  • et al.

We report the direct observation of a "resonance" mode in the lowest-energy optic phonon very near the zone center around (111) in the multiferroic BiFeO$_3$ using neutron scattering methods. The phonon scattering intensity is enhanced when antiferromagnetic (AFM) order sets in at T$_N = 640$~K, and it increases on cooling. This "resonance" is confined to a very narrow region in energy-momentum space where no spin-wave excitation intensity is expected, and it can be modified by an external magnetic field. Our results suggest the existence of a novel coupling between the lattice and spin fluctuations in this multiferroic system in which the spin-wave excitations are mapped onto the lattice vibrations via the Dzyaloshinskii-Moriya (DM) interaction.

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