Origin of electromagnon excitations in multiferroic RMnO3

R. Valdés Aguilar, M. Mostovoy, A. B. Sushkov, C. L. Zhang, Y. J. Choi, S. W. Cheong, H. D. Drew

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Abstract

Electromagnon excitations in multiferroic orthorhombic RMnO3 are shown to result from the Heisenberg coupling between spins despite the fact that the static polarization arises from the much weaker Dzyaloshinskii-Moriya exchange interaction. We present a model incorporating the structural characteristics of this family of manganites that is confirmed by far infrared transmission data as a function of temperature and magnetic field and inelastic neutron scattering results. A deep connection is found between the magnetoelectric dynamics of the spiral phase and the static magnetoelectric coupling in the collinear E phase of this family of manganites.

Original languageEnglish
Article number047203
JournalPhysical review letters
Volume102
Issue number4
DOIs
Publication statusPublished - 2009 Jan 26

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Valdés Aguilar, R., Mostovoy, M., Sushkov, A. B., Zhang, C. L., Choi, Y. J., Cheong, S. W., & Drew, H. D. (2009). Origin of electromagnon excitations in multiferroic RMnO3. Physical review letters, 102(4), [047203]. https://doi.org/10.1103/PhysRevLett.102.047203