Electromagnon and phonon excitations in multiferroic TbMnO3

We have performed Raman measurements on 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 electromag...

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Published inarXiv.org
Main Authors Rovillain, P, Liu, J, Cazayous, M, Gallais, Y, M -A Measson, Sakata, H, Sacuto, A
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 24.07.2012
Subjects
Crystallography
Excitation
Ferroelectric materials
Ferroelectricity
Phonons
Physics - Strongly Correlated Electrons
Polarization
Single crystals
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Summary:We have performed Raman measurements on 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 dependences 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1207.5566