title: Magnetic excitations in the low-temperature ferroelectric phase of multiferroic YMn2O5 using inelastic neutron scattering.
abstract: We studied magnetic excitations in a low-temperature ferroelectric phase of the multiferroic YMn(2)O(5) using inelastic neutron scattering (INS). We identify low-energy magnon modes and establish a correspondence between the magnon peaks observed by INS and electromagnon peaks observed in optical absorption [A. B. Sushkov et al., Phys. Rev. Lett. 98, 027202 (2007).]. Furthermore, we explain the microscopic mechanism, which results in the lowest-energy electromagnon peak, by comparing the inelastic neutron spectral weight with the polarization in the commensurate ferroelectric phase.
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714, USA.
authors.forename: J-H
authors.initials: JH
authors.lastname: Kim
authors.forename: M A
authors.initials: MA
authors.lastname: van der Vegte
authors.forename: A
authors.initials: A
authors.lastname: Scaramucci
authors.forename: S
authors.initials: S
authors.lastname: Artyukhin
authors.forename: J-H
authors.initials: JH
authors.lastname: Chung
authors.forename: S
authors.initials: S
authors.lastname: Park
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong
authors.forename: M
authors.initials: M
authors.lastname: Mostovoy
authors.forename: S-H
authors.initials: SH
authors.lastname: Lee