Electromagnons in multiferroic YMn2O5 and TbMn2O5.
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 steplike 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.
Sushkov
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Materials Research Science and Engineering Center, University of Maryland, College Park, Maryland 20742, USA.
Aguilar
R Valdés
RV
Park
S
S
Cheong
S-W
SW
Drew
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HD