Magnetic field induced dehybridization of the electromagnons in multiferroic TbMnO3

P. Rovillain, M. Cazayous, Y. Gallais, M. A. Measson, A. Sacuto, H. Sakata, Masahito Mochizuki

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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 baxis allow us to detect a new electromagnon resonance in agreement with a Heisenberg model.

Original languageEnglish
Article number027202
JournalPhysical Review Letters
Volume107
Issue number2
DOIs
Publication statusPublished - 2011 Jul 5
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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