Schiebl, M., Shuvaev, A. M., Pimenov, A., Johnstone, G. E., Dziom, V., Mukhin, A. A., Ivanov, V. Yu., & Pimenov, A. (2015). Order-disorder type critical behavior at the magnetoelectric phase transition in multiferroic DyMnO₃. Physical Review B, 91(224205). https://doi.org/10.1103/physrevb.91.224205
E138-05 - Forschungsbereich Solid State Spectroscopy
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Zeitschrift:
Physical Review B
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ISSN:
2469-9950
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Datum (veröffentlicht):
1-Jun-2015
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Umfang:
10
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Verlag:
AMER PHYSICAL SOC
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Peer Reviewed:
Ja
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Keywords:
Condensed Matter Physics; Electronic, Optical and Magnetic Materials
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Abstract:
We present the results of detailed dielectric investigations of the relaxation dynamics in DyMnO3 multiferroic manganite. A strong low-frequency relaxation process near the paraelectric-ferroelectric phase transition is observed. We provide experimental evidence to show that this relaxation mode corresponds to a chirality switching of the spin cycloid in DyMnO3. We demonstrate that the relaxation dynamics in DyMnO3 is typical for an order-disorder phase transition and may be understood within a simple model with a double-well potential. These results suggest the interpretation of the paraelectric sinusoidal phase in manganites as a dynamical equilibrium of magnetic cycloids with opposite chiralities.
