Colossal Spin-Phonon Anomalies and the Ferroelectric Phase Transition in   the Model Multiferroic Bifeo3
  We report a temperature-dependent Raman and neutron scattering investigation of the multiferroic material bismuth ferrite BiFeO3 (BFO). 
R. Haumont, J. Kreisel, P. Bouvier, F. Hippert