Evidence for an electromagnon in GdMn2O5 : A multiferroic with a large electric polarization
Résumé
We report in this paper the dynamical properties of GdMn2O5 studied by inelastic neutron scattering and infrared spectroscopy assisted by ab initio calculations. Our work sheds light on the electromagnon, a magnetic mode that can be excited by an electric field. Combining spin-wave measurements, simulations, and ab initio calculations of the single-ion anisotropies and the superexchange interactions, we describe in detail the
magnetic contribution to this mode. An exhaustive study of the temperature and polarization dependence of its electroactivity completes this comprehensive study of the complex GdMn2O5 system.
Domaines
Matière Molle [cond-mat.soft]
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