Two-phonon coupling to the antiferromagnetic phase transition in multiferroic BiFeO3

Abstract

A prominent band centered at around 1000-1300 cm-1 and associated with resonant enhancement of two-phonon Raman scattering is reported in multiferroic BiFeO3 thin films and single crystals. A strong anomaly in this band occurs at the antiferromagnetic Neel temperature. This band is composed of three peaks, assigned to 2A4, 2E8, and 2E9 Raman modes. While all three peaks were found to be sensitive to the antiferromagnetic phase transition, the 2E8 mode, in particular, nearly disappears at TN on heating, indicating a strong spin-two phonon coupling in BiFeO3.

12 pages with figures

References in corpus (4)

• Weak ferromagnetism and magnetoelectric coupling in bismuth ferrite
• Colossal Spin-Phonon Anomalies and the Ferroelectric Phase Transition in the Model Multiferroic Bifeo3
• Infrared and THz studies of polar phonons and improper magnetodielectric effect in multiferroic BFO3 ceramics
• Electric field effect on BiFeO${}_3$ single crystal investigated by Raman spectroscopy

Cited by in corpus (7)

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• Spin-Charge-Lattice Coupling through Resonant Multi-Magnon Excitations in Multiferroic BiFeO3
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• Interplay between magnetic and lattice excitations in BiFeO${}_3$
• Anomalous low-energy phonons in nearly tetragonal BiFeO3 thin films
• Anharmonic magnon excitations in noncollinear and charge-ordered RbFe${}^{2+}$Fe${}^{3+}$F${}_6$
• Built-in electric field induces polarization rotation in bilayer BiFeO3/(Ba,Sr)TiO3 thin films