Optical anisotropy and charge-transfer transition energies in BiFeO3 from 1.0 to 5.5 eV.

We discuss uniaxial optical anisotropy in single-crystal BiFeO3 determined by spectroscopic ellipsometry from 1.0 to 5.5 eV. The dielectric function ϵ = ϵ1 + iϵ2 and refractive index N = n + ik spectra of BiFeO3 are extracted for the tensor components along its ordinary and extraordinary principal axes. Using the standard line-shape analysis, we also obtain the energies of the major optical structures associated with the charge-transfer transitions in BiFeO3. [ABSTRACT FROM AUTHOR]