Optical spectroscopy study on the photo-response in multiferroic BiFeO₃

Auteurs

F. Burkert, J. Kreisel, and C. A. Kuntscher

Référence

Applied Physics Letters, vol. 109, no. 18, p. 182903, 2016

Description

We investigate the underlying mechanism of the photostriction effect in single-crystalline BiFeO₃ by transmission measurements in the infrared and visible frequency range under continuous illumination with a green laser (λ = 532 nm). The small photo-induced changes in the transmission spectrum reveal three well-defined absorption features at 1.22 eV, 1.66 eV, and 2.14 eV, which we assign to charge-transfer excitons and in-gap defect states probably related to oxygen vacancies. The intensity of the three absorption features follows a linear dependence on the illumination intensity for an irradiance above 90 W/m².

Lien

doi:10.1063/1.4966548