Spectral origin of the colossal magnetodielectric effect in multiferroic ${\mathrm{DyMn}}_{2}{\mathrm{O}}_{5}$

Spectral origin of the colossal magnetodielectric effect in multiferroic ${DyMn}_{2} O_{5}$

A. B. Sushkov, Ch. Kant, M. Schiebl, A. M. Shuvaev, Anna Pimenov, Andrei Pimenov, Bernd Lorenz, S. Park, S.-W. Cheong, Maxim Mostovoy, and H. D. Drew

Phys. Rev. B 90, 054417 – Published 20 August 2014

Abstract

The origin of the colossal magnetodielectric (CMD) effect in ${DyMn}_{2} O_{5}$ [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 ${cm}^{- 1}$ 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 ${Dy}^{3 +}$ ions. The experimental and theoretical evidence supports an electromagnon origin of the CMD effect.

Received 14 March 2014
Revised 3 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.054417

Authors & Affiliations

A. B. Sushkov^1,*, Ch. Kant², M. Schiebl², A. M. Shuvaev², Anna Pimenov², Andrei Pimenov², Bernd Lorenz³, S. Park^4,†, S.-W. Cheong⁴, Maxim Mostovoy⁵, and H. D. Drew¹

¹Materials Research Science and Engineering Center and Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA
²Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria
³Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204-5002, USA
⁴Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
⁵Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands

^*sushkov@umd.edu
^†Current address: Department of Physics, Chung-Ang University, Seoul 156, South Korea.

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Vol. 90, Iss. 5 — 1 August 2014

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Physical Review B

covering condensed matter and materials physics

Spectral origin of the colossal magnetodielectric effect in multiferroic ${DyMn}_{2} O_{5}$

A. B. Sushkov, Ch. Kant, M. Schiebl, A. M. Shuvaev, Anna Pimenov, Andrei Pimenov, Bernd Lorenz, S. Park, S.-W. Cheong, Maxim Mostovoy, and H. D. Drew

Phys. Rev. B 90, 054417 – Published 20 August 2014

Abstract

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Physical Review B

covering condensed matter and materials physics

Spectral origin of the colossal magnetodielectric effect in multiferroic DyMn2O5

A. B. Sushkov, Ch. Kant, M. Schiebl, A. M. Shuvaev, Anna Pimenov, Andrei Pimenov, Bernd Lorenz, S. Park, S.-W. Cheong, Maxim Mostovoy, and H. D. Drew

Phys. Rev. B 90, 054417 – Published 20 August 2014

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Spectral origin of the colossal magnetodielectric effect in multiferroic ${DyMn}_{2} O_{5}$