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Sinusoidal electromagnon in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi></mml:math>MnO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>: Indication of anomalous magnetoelectric coupling
The optical spectra in the family of multiferroic manganites $R$MnO${}_{3}$ is a great puzzle. Current models cannot explain the fact that two strong electromagnons are present in the noncollinear spin cycloidal phase, with only one electromagnon surviving the transition into the collinear spin sinusoidal phase. We show that this is …