Electric field effect on BiFeO${}_3$ single crystal investigated by Raman spectroscopy

Abstract

Micro-Raman spectroscopy has been used to study lattice dynamics associated with the ferroelectric domains of a BiFeO${}_3$ single crystal at low temperature. The phonon assignment shows a large frequency splitting between the transverse and longitudinal components of the A${}_1$ phonon mode related to the Bi-O bonds in contrast with thin films where the splitting is negligible. Applying an external electric field induces frequency shifts of the low energy modes related to the Bi-O bonds. These softenings are due to a tensile stress via the piezoelectric effect. We give estimates of the phonon deformation potentials.

arXiv comment10 pages, 2 figures

References in corpus (4)

• Systematic treatment of displacements, strains and electric fields in density-functional perturbation theory
• Very large spontaneous electric polarization in BiFeO3 single crystals at room temperature and its evolution under cycling fields
• 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

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• Polarized Raman spectroscopy of nearly-tetragonal BiFeO${}_3$ thin films
• Polar phonons and spin excitations coupling in multiferroic BiFeO3 crystals
• Phase transition close to room temperature in BiFeO3 thin films
• Phase transitions and ferroelectrics: revival and the future in the field
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• Interplay between magnetic and lattice excitations in BiFeO${}_3$
• Temperature evolution of the band-gap in BiFeO3 traced by resonant Raman scattering
• Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressure by helium implantation
• Structural investigation of (111) oriented (BiFeO3)(1-x)Λ/(LaFeO3)xΛ superlattices by X-ray diffraction and Raman spectroscopy