Magnetic field induced dehybridization of the electromagnons in multiferroic TbMnO3

Abstract

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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Cited by in corpus (10)

• Dynamical Multiferroicity
• Terahertz and infrared spectroscopic evidence of phonon-paramagnon coupling in hexagonal piezomagnetic YMnO3
• Electromagnon and phonon excitations in multiferroic TbMnO3
• Magnons and Magnetodielectric Effects in CoCr${}_2$O${}_4$: Raman Scattering Studies
• Sinusoidal electromagnon in RMnO3: Indication of anomalous magnetoelectric coupling
• Molecular-spin dynamics study of electromagnons in multiferroic RMn${}_2$O${}_5$
• Observation of Unusual Magnetoelastic Effects in a Quasi-1D Spiral Magnet
• Spin-wave dispersion and magnon chirality in multiferroic TbMnO3
• Theory of Magnetic-Field-Induced Polarization Flop in Spin-Spiral Multiferroics
• Magnetoelectric susceptibility tensor of multiferroic TbMnO3 with cycloidal antiferromagnetic structure in external field