Electromagnons in multiferroic YMn2O5 and TbMn2O5

Abstract

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.

4 pages, 4 figures, submitted

References in corpus (4)

• Magnetically driven ferroelectric order in Ni${}_3$V${}_2$O${}_8$
• Possible evidence for electromagnons in multiferroic manganites
• Coupling of phonons and electromagnons in GdMnO_3
• IR Phonon signatures of multiferroicity in TbMn${}_2$O${}_5$

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