Electromagnon and phonon excitations in multiferroic TbMnO3

Abstract

We have performed Raman measurements on TbMnO3 single crystal under magnetic field along the three crystallographic directions. The flip of the spin spiral plane creates an electromagnon excitation. In addition to the electromagnons induced by the Heisenberg coupling, we have detected the electromagnon created by the Dzyaloshinskii-Moriya interaction along the c axis. We have identified all the vibrational modes of TbMnO3. Their temperature dependences show that only one phonon observed along the polarization axis is sensitive to the ferroelectric transition. This mode is tied to the Tb3+ ion displacements that contribute to the ferroelectric polarization.

References in corpus (12)

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• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Electric-field control of spin waves at room temperature in multiferroic BiFeO3
• Dynamical magneto-electric coupling in helical magnets
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• Model for twin electromagnons and magnetically induced oscillatory polarization in multiferroic RMnO${}_3$
• Relationship between ferroelectricity and Dzyaloshinskii-Moriya interaction in multiferroics and the effect of bond-bending
• Magnetic field induced dehybridization of the electromagnons in multiferroic TbMnO3
• Infrared reflectivity of the phonon spectra in multiferroic TbMnO3
• Zone center phonons of the orthorhombic RMnO3 (R = Pr, Eu, Tb, Dy, Ho) perovskites

Cited by in corpus (4)

• Optically probing symmetry breaking in the chiral magnet Cu2OSeO3
• A tunable time-resolved spontaneous Raman spectroscopy setup for probing ultrafast collective excitation and quasiparticle dynamics in quantum materials
• Lattice-Mediated Magnetic Order Melting in TbMnO3
• Modifying the magnetoelectric coupling in TbMnO${}_3$ by low-level Fe${}^{3+}$ substitution