title: Spin-phonon coupling in multiferroic YbMnO(3) studied by Raman scattering.
abstract: Hexagonal YbMnO(3) bulk polycrystals were prepared and studied by Raman scattering in the temperature range of 15-300 K. A total of 15 phonon modes of A(1), E(1) and E(2) type were identified. Some E(2) phonon modes showed anomalous temperature variations in frequency at T(N)∼80 K, suggesting a coupling between the spin and phonon systems below T(N). As another evidence of spin-phonon coupling, softening of an A(1)-phonon mode for the O-Mn vibration was observed at ∼T(N). Substitution of Mn by Al suggests this view.
authors.affiliation: Department of Electronics, Kyoto Institute of Technology, Kyoto 606-8585, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Fukumura
authors.forename: N
authors.initials: N
authors.lastname: Hasuike
authors.forename: H
authors.initials: H
authors.lastname: Harima
authors.forename: K
authors.initials: K
authors.lastname: Kisoda
authors.forename: K
authors.initials: K
authors.lastname: Fukae
authors.forename: T
authors.initials: T
authors.lastname: Yoshimura
authors.forename: N
authors.initials: N
authors.lastname: Fujimura