Abstract
We present the results of detailed dielectric investigations of the relaxation dynamics in 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 . We demonstrate that the relaxation dynamics in 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.
1 More- Received 10 March 2015
- Revised 8 May 2015
DOI:https://doi.org/10.1103/PhysRevB.91.224205
©2015 American Physical Society