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Electromagnons in multiferroic YMn2O5 and TbMn2O5

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arxiv cond-mat/0608707 v2 pith:YPEQNK4O submitted 2006-08-31 cond-mat.str-el cond-mat.mtrl-sci

A. B. Sushkov , R. Valdes Aguilar , S. Park , S-W. Cheong , H. D. Drew This is my paper · ORCID
classification cond-mat.str-elcond-mat.mtrl-sci
keywords electromagnonsmagneticmultiferroicstbmn2o5ymn2o5anomalycolossalcommensurate--incommensurate
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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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