期刊
PHYSICAL REVIEW LETTERS
卷 98, 期 2, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.027202
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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 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.
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