Order-disorder type critical behavior at the magnetoelectric phase transition in multiferroic DyMnO3

M. Schiebl, A. Shuvaev, Anna Pimenov, G. E. Johnstone, V. Dziom, A. A. Mukhin, V. Yu. Ivanov, and A. Pimenov
Phys. Rev. B 91, 224205 – Published 29 June 2015

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.

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  • Received 10 March 2015
  • Revised 8 May 2015

DOI:https://doi.org/10.1103/PhysRevB.91.224205

©2015 American Physical Society

Authors & Affiliations

M. Schiebl1, A. Shuvaev1, Anna Pimenov1, G. E. Johnstone1, V. Dziom1, A. A. Mukhin2, V. Yu. Ivanov2, and A. Pimenov1

  • 1Institute of Solid State Physics, Vienna University of Technology, A-1040 Vienna, Austria
  • 2Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia

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Vol. 91, Iss. 22 — 1 June 2015

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