Spectral origin of the colossal magnetodielectric effect in multiferroicDyMn2O5

Autor:	Sang-Wook Cheong, Alexey Shuvaev, Andrei Pimenov, M. Schiebl, A. Pimenov, Bernd Lorenz, H. D. Drew, S. Park, Andrei B. Sushkov, Maxim Mostovoy, Ch. Kant
Rok vydání:	2014
Předmět:	Physics Condensed matter physics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Ion Magnetic field Dipole 0103 physical sciences Multiferroics 010306 general physics 0210 nano-technology
Zdroj:	Physical Review B. 90
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.90.054417
Popis:	The origin of the colossal magnetodielectric (CMD) effect in ${\mathrm{DyMn}}_{2}{\mathrm{O}}_{5}$ [N. Hur et al., Phys. Rev. Lett. 93, 107207 (2004)] has been an outstanding question in multiferroics. Here, we report the activation of the electric dipole mode at 4--5 ${\mathrm{cm}}^{\ensuremath{-}1}$ 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 ${\mathrm{Dy}}^{3+}$ ions. The experimental and theoretical evidence supports an electromagnon origin of the CMD effect.
Databáze:	OpenAIRE
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