Polarized Inelastic Neutron Scattering study of TbMnO$_3$

ORAL

Abstract

Low energy collective excitations in TbMnO$_3$ were examined using polarized inelastic neutron scattering. By probing spin flip and non-spin-flip excitations with a guide field along wave vector transfer, Q, we separated the magnetic and vibrational components of excitations at high symmetry points in the Brillouin zone. We report signatures of coupled magnon-phonon excitations in the ferroelectric-spiral state, which disappear in the paramagnetic phase. These results will be discussed in terms of current models of electromagnons in the \textit{R}MnO$_3$ multiferroic family.

*Work supported by NSF through DMR-0706553 and DMR-0847652.

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Authors

  • Rolando Valdes Aguilar

    • Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218

  • I. Cabrera

    • Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218

  • Y. Zhao

    • Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218

  • C. Broholm

    • Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218

  • N.P. Armitage

    • Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218

  • H.D. Drew

    • University of Maryland, College Park, MD 20742

  • S-W. Cheong

    • Rutgers University, Piscataway, NJ 08854

  • C.L. Zhang

    • Rutgers University, Piscataway, NJ 08854