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Spectral origin of the colossal magnetodielectric effect in multiferroic DyMn2O5

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arxiv 1403.3717 v1 pith:LK6AVY26 submitted 2014-03-14 cond-mat.str-el

Spectral origin of the colossal magnetodielectric effect in multiferroic DyMn2O5

A. B. Sushkov , Ch. Kant , M. Schiebl , A. M. Shuvaev , Anna Pimenov , Andrei Pimenov , B. Lorenz , S. Park
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S-W. Cheong Maxim Mostovoy H. D. Drew
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classification cond-mat.str-el
keywords effectorigincolossaldymn2o5electromagnonmagnetodielectricmodeaccounts
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The origin of the colossal magnetodielectric effect in DyMn2O5 [1] 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 the electromagnon origin of the CMD effect.

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