Magnetic field induced dehybridization of the electromagnons in multiferroic TbMnO3

Details Magnetic field induced dehybridization of the electromagnons in multiferroic TbMnO3 Magnetic field induced dehybridization of the electromagnons in multiferroic TbMnO3

2011-07-04

arxiv.org/abs/1107.0593v1

Phys. Rev. Lett. 107, 027202 (2011)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.107.027202

We have studied the impact of the magnetic field on the electromagnon excitations in TbMnO3 crystal. Applying 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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