Infrared reflectivity of the phonon spectra in multiferroic TbMnO3

Abstract

We measured the temperature dependent infrared reflectivity spectra of TbMnO3 with the electric field of light polarized along each of the three crystallographic axes. We analyzed the effect, on the phonon spectra, of the different phase transitions occurring in this material. We show that the antiferromagnetic transition at TN renormalizes the phonon parameters along the three directions. Our data indicate that the electromagnon, observed along the a direction, has an important contribution to the building of the dielectric constant. Only one phonon, observed along the c-axis, has anomalies at the ferroelectric transition. This phonon is built mostly from Mn vibrations, suggesting that Mn displacements are closely related to the formation of the ferroelectric order.

arXiv comment7 pages; 6 figures

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Cited by in corpus (9)

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• Electromagnon and phonon excitations in multiferroic TbMnO3
• Spin-lattice and magnetoelectric couplings enhanced by orbital degrees of freedom in polar magnets
• Infrared-active phonon modes in monoclinic multiferroic MnWO4
• Second-harmonic phonon spectroscopy of $\alpha$-quartz
• Multiple magnetic ordering phenomena in multiferroic o-HoMnO3
• Modifying the magnetoelectric coupling in TbMnO${}_3$ by low-level Fe${}^{3+}$ substitution
• Infrared phonon spectroscopy on the Cairo pentagonal antiferromagnet Bi2Fe4O9: a study through the pressure induced structural transition