Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals

P. Rovillain; M. Cazayous; Y. Gallais; A. Sacuto; R. P. S. M. Lobo; D. Lebeugle; D. Colson

doi:10.1103/PhysRevB.79.180411

Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals

Strongly Correlated Electrons 2010-10-12 v1 Materials Science

Authors: P. Rovillain , M. Cazayous , Y. Gallais , A. Sacuto , R. P. S. M. Lobo , D. Lebeugle , D. Colson

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Abstract

Raman scattering measurements on BiFeO3 single crystals show an important coupling between the magnetic order and lattice vibrations. The temperature evolution of phonons shows that the lowest energy E and A1 phonon modes are coupled to the spin order up to the Neel temperature. Furthermore, low temperature anomalies associated with the spin re-orientation are observed simultaneously in both the E phonon and the magnon. These results suggest that magnetostriction plays an important role in BiFeO3.

Keywords

magnetic materials and spin systems multiferroic phonon physics

Cite

@article{arxiv.0905.1891,
  title  = {Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals},
  author = {P. Rovillain and M. Cazayous and Y. Gallais and A. Sacuto and R. P. S. M. Lobo and D. Lebeugle and D. Colson},
  journal= {arXiv preprint arXiv:0905.1891},
  year   = {2010}
}

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