Abstract
Based on temperature dependent far infrared transmission spectra of and 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.
- Received 22 September 2006
DOI:https://doi.org/10.1103/PhysRevLett.98.027202
©2007 American Physical Society
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Retrospective—Electromagnons offer the best of two worlds
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