Sinusoidal electromagnon in RMnO3: Indication of anomalous magnetoelectric coupling

Details Sinusoidal electromagnon in RMnO3: Indication of anomalous magnetoelectric coupling Sinusoidal electromagnon in RMnO3: Indication of anomalous magnetoelectric coupling

2011-09-19

arxiv.org/abs/1109.3965v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures

Scientific paper

The optical spectra in the family of multiferroic manganites RMnO3 is a great puzzle. Current models can not explain the fact that two strong electromagnons are present in the non-collinear spin cycloidal phase, with only one electromagnon surviving the transition into the collinear spin sinusoidal phase. We show that this is a signature of the presence of anomalous magnetoelectric coupling that breaks rotational invariance in spin space and generates oscillatory polarization in the ground state.

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