Magnetic Field Induced Dehybridization of the Electromagnons in Multiferroic TbMnO3

P. Rovillain, M. Cazayous, Y. Gallais, M-A. Measson, A. Sacuto, H. Sakata, and M. Mochizuki
Phys. Rev. Lett. 107, 027202 – Published 5 July 2011

Abstract

We have studied the impact of the magnetic field on the electromagnon excitations in TbMnO3 crystal. Applying a magnetic field along the c axis, we show that the electromagnons transform into pure antiferromagnetic modes, losing their polar character. Entering in the paraelectric phase, we are able to track the spectral weight transfer from the electromagnons to the magnon excitations and we discuss the magnetic excitations underlying the electromagnons. We also point out the phonons involved in the phase transition process. This reveals that the Mn-O distance plays a key role in understanding the ferroelectricity and the polar character of the electromagnons. Magnetic field measurements along the b axis allow us to detect a new electromagnon resonance in agreement with a Heisenberg model.

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  • Received 14 March 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.027202

© 2011 American Physical Society

Authors & Affiliations

P. Rovillain1, M. Cazayous1, Y. Gallais1, M-A. Measson1, A. Sacuto1, H. Sakata2, and M. Mochizuki3

  • 1Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS), Université Paris Diderot-Paris 7, 75205 Paris cedex 13, France
  • 2Department of Physics, Tokyo University of Science, 1-3 Kagurazaka Shinjyuku-ku Tokyo 162-8601, Japan
  • 3Department of Applied Physics, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

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Issue

Vol. 107, Iss. 2 — 8 July 2011

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