Evidence for an electric-dipole active continuum band of spin excitations in multiferroic TbMnO3

Y. Takahashi, N. Kida, Y. Yamasaki, J. Fujioka, T. Arima, R. Shimano, S. Miyahara, M. Mochizuki, N. Furukawa, Y. Tokura

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Abstract

The wide range optical spectra on a multiferroic prototype TbMnO3 have been investigated to clarify the origin of spin excitations observed in the far-infrared region. We elucidate the full band structure, whose high energy edge (133cm-1) exactly corresponds to twice of the highest-lying magnon energy. Thus the origin of this absorption band is clearly assigned to two-magnon excitation driven by the electric field of light. There is an overlap between the two-magnon and phonon energy ranges, where the strong coupling between them is manifested by the frequency shift and transfer of oscillator strength of the phonon mode.

Original languageEnglish
Article number187201
JournalPhysical Review Letters
Volume101
Issue number18
DOIs
Publication statusPublished - 2008 Oct 27
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Takahashi, Y., Kida, N., Yamasaki, Y., Fujioka, J., Arima, T., Shimano, R., Miyahara, S., Mochizuki, M., Furukawa, N., & Tokura, Y. (2008). Evidence for an electric-dipole active continuum band of spin excitations in multiferroic TbMnO3. Physical Review Letters, 101(18), [187201]. https://doi.org/10.1103/PhysRevLett.101.187201