title: Observation of phonons in multiferroic BiFeO(3) single crystals by Raman scattering.
abstract: We have grown BiFeO(3) bulk single crystals by a flux method and characterized the phonon spectra in detail by Raman scattering in the temperature range 4-1100 K. All the 13 Raman-active phonon modes predicted by group theory, 4A(1)+9E, were observed at low temperature and successfully assigned by a polarized Raman measurement. Moreover, drastic spectral changes in the Raman spectra were observed at temperatures 600-700 K and 1000-1100 K. These features are discussed from the viewpoint of phonon coupling with the magnetic ordering and the structural phase transition, respectively.
authors.affiliation: Department of Electronics and Information Science, Kyoto Institute of Technology, Kyoto 606-8585, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Fukumura
authors.forename: S
authors.initials: S
authors.lastname: Matsui
authors.forename: H
authors.initials: H
authors.lastname: Harima
authors.forename: T
authors.initials: T
authors.lastname: Takahashi
authors.forename: T
authors.initials: T
authors.lastname: Itoh
authors.forename: K
authors.initials: K
authors.lastname: Kisoda
authors.forename: M
authors.initials: M
authors.lastname: Tamada
authors.forename: Y
authors.initials: Y
authors.lastname: Noguchi
authors.forename: M
authors.initials: M
authors.lastname: Miyayama