Electromagnon and phonon excitations in multiferroic TbMnO3

Rovillain, P; Liu, J; Cazayous, M; Gallais, Y; Measson, MA; Sakata, H; Sacuto, A

Electromagnon and phonon excitations in multiferroic TbMnO3

Date

2012-07-30

Authors

Publisher

Americal Physical Society

Abstract

We have performed Raman measurements on a TbMnO3 single crystal under magnetic field along the three crystallographic directions. The flip of the spin spiral plane creates an electromagnon excitation. In addition to the electromagnons induced by the Heisenberg coupling, we have detected the electromagnon created by the Dzyaloshinskii-Moriya interaction along the c axis. We have identified all the vibrational modes of TbMnO3. Their temperature dependencies show that only one phonon observed along the polarization axis is sensitive to the ferroelectric transition. This mode is tied to the Tb3+ ion displacements that contribute to the ferroelectric polarization. © 2012, American Physical Society.

Keywords

Raman spectroscopy, Crystals, Crystallography, Phonons, Spin, Temperature dependence

Citation

Rovillain, P., Liu, J., Cazayous, M., Gallais, Y., Measson, M. A., Sakata, H., & Sacuto, A. (2012). Electromagnon and phonon excitations in multiferroic TbMnO3. Physical Review B, 86, 014437. doi:10.1103/PhysRevB.86.014437