Colossal magnon-phonon coupling in multiferroic Eu0.75 Y0.25 Mn O3

R. Valdés Aguilar, A. B. Sushkov, C. L. Zhang, Y. J. Choi, S. W. Cheong, H. D. Drew

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Abstract

We report the spectra of magnetically induced electric dipole absorption in Eu0.75 Y0.25 Mn O3 from temperature-dependent far-infrared spectroscopy (10-250 cm-1). These spectra, which occur only in the e a polarization, consist of two relatively narrow electromagnon features with onset at TFE =30 K and a broad absorption band that persists to temperatures well above TN =47 K. The observed excitations account for the step up of the static dielectric constant in the ferroelectric phase. The electromagnon at 80 cm-1 is observed to be strongly coupled to the nearby lowest optical phonon which transfers more than 1/2 of its spectral weight to the magnon. We attribute the origin of the broad background absorption to the two-magnon-emission decay process of the phonon.

Original languageEnglish
Article number060404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number6
DOIs
Publication statusPublished - 2007 Aug 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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