The origin of the colossal magnetodielectric (CMD) effect in DyMn2O5 [N. Hur, Phys. Rev. Lett. 93, 107207 (2004)PRLTAO0031-900710.1103/PhysRevLett.93. 107207] has been an outstanding question in multiferroics. Here, we report the activation of the electric dipole mode at 4-5 cm-1 in an applied magnetic field, which fully accounts for the CMD effect. We examine two alternative explanations of this mode: an electromagnon and transitions between f-electron levels of Dy3+ ions. The experimental and theoretical evidence supports an electromagnon origin of the CMD effect.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Aug 20 2014|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics