Lattice dynamics of multiferroic BiFeO3 studied by inelastic x-ray scattering

[en] 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.

Disciplines :

Physics

Author, co-author :

Borissenko, Elena

Goffinet, Marco ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Bosak, Alexei

Rovillain, Pauline

Cazayous, Maximilien

Colson, Dorothée

Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Krisch, Michael

Language :

English

Title :

Lattice dynamics of multiferroic BiFeO3 studied by inelastic x-ray scattering

Publication date :

2013

Journal title :

Journal of Physics: Condensed Matter

ISSN :

0953-8984

eISSN :

1361-648X

Publisher :

Institute of Physics, Bristol, United Kingdom

Volume :

Pages :

102201

Peer reviewed :

Peer Reviewed verified by ORBi

Tags :

Tier-1 supercomputer
CÉCI : Consortium des Équipements de Calcul Intensif

Available on ORBi :

since 07 July 2013

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