Raman study of the phonon symmetries in BiFeO${}_3$ single crystals

Abstract

In bismuth ferrite (BiFeO3), antiferromagnetic and ferroelectric order coexist at room temperature, making it of particular interest for studying magnetoelectric coupling. The mutual control of magnetic and electric properties is very useful for a wide variety of applications. This has led to an enormous amount of research into the properties of BiFeO${}_3$. Nonetheless, one of the most fundamental aspects of this material, namely the symmetries of the lattice vibrations, remains controversial.We present a comprehensive Raman study of BiFeO${}_3$ single crystals with the approach of monitoring the Raman spectra while rotating the polarization direction of the excitation laser. Our method results in unambiguous assignment of the phonon symmetries and explains the origin of the controversy in the literature. Furthermore, it provides access to the Raman tensor elements enabling direct comparison with theoretical calculations. Hence, this allows the study of symmetry breaking and coupling mechanisms in a wide range of complex materials and may lead to a noninvasive, all-optical method to determine the orientation and magnitude of the ferroelectric polarization.

arXiv comment5 pages, 4 figures, 1 table

References in corpus (10)

• Multiferroicity, The coupling between magnetic and polarization
• First-principles study of spontaneous polarization in multiferroic BiFeO${}_3$
• Electric-field-induced spin-flop in BiFeO3 single crystals at room-temperature
• Electric-field control of spin waves at room temperature in multiferroic BiFeO3
• Observation of electromagnon excitations in the BiFe0${}_3$ spiral magnet
• Infrared phonon dynamics of multiferroic BiFeO3 single crystal
• Temperature-dependent properties of the magnetic order in single-crystal BiFeO3
• Singe ferroelectric and chiral magnetic domain of single-crystalline BiFeO${}_3$ in an electric field
• Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals
• Stability of exfoliated Bi${}_2$Sr${}_2$Dy${}_x$Ca${}_{1-x}$Cu${}_2$O${}_{8+\delta }$ studied by Raman microscopy

Cited by in corpus (5)

• Spin-orbit excitations and electronic structure of the putative Kitaev magnet $\alpha$-RuCl${}_3$
• Structure and spin dynamics of multiferroric BiFeO${}_3$
• Driving spin excitations by hydrostatic pressure in BiFeO3
• Local phonon mode in thermoelectric Bi2Te2Se from charge neutral antisites
• Low vibration high numerical aperture automated variable temperature Raman microscope