Browsing by Author "Krisch, M"

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    Lattice dynamics of multiferroic BiFeO3 studied by inelastic x-ray scattering
    (IOP Publishing Ltd., 2013-03-13) Borissenko, E; Goffinet, M; Bosak, A; Rovillain, P; Cazayous, M; Colson, D; Ghosez, P; Krisch, M
    We report an experimental study of the phonon dispersion in BiFeO3 single crystals at ambient conditions by inelastic x-ray scattering (IXS). The phonon dispersions were recorded along several symmetry directions up to 35 meV. Our results compare favorably with first-principles calculations performed using density functional theory (DFT) within the local-density approximation (LDA). We resolve a discrepancy concerning the symmetry of the optical phonon branches observed by Raman spectroscopy, determine the energy of the lowest Raman and infrared silent mode, and derive a subset of the elastic moduli of BiFeO3. © 2011 IOP Publishing LTD.