Sinusoidal electromagnon in RMnO3: Indication of anomalous magnetoelectric coupling

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.Comment: 5 pages, 2 figure

25 anos de melhoramento genético de trigo em Mato Grosso do Sul.

Historico; Producao de trigo em Mato Grosso do Sul; Melhoramento de trigo em Mato Grosso do Sul.bitstream/item/40075/1/DOC9-99-MGT.pd