Electromagnons in multiferroic YMn2O5 and TbMn2O5

Details Electromagnons in multiferroic YMn2O5 and TbMn2O5 Electromagnons in multiferroic YMn2O5 and TbMn2O5

2006-08-31

arxiv.org/abs/cond-mat/0608707v2

Phys. Rev. Lett. 98, 027202 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted

Scientific paper

Based on temperature dependent far infrared transmission spectra of YMn2O5 and TbMn2O5 single crystals, we report the observation of electric dipole-active magnetic excitations, or electromagnons, in these multiferroics. Electromagnons are found to be directly responsible for the step-like anomaly of the static dielectric constant at the commensurate--incommensurate magnetic transition and are the origin of the colossal magneto-dielectric effect reported in these multiferroics.

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