Temperature evolution of the band gap in BiFeO3 traced by resonant Raman scattering
(2016) Physical review. B, Condensed matter and materials physics — Vol. 93, n° 12, p. 125204 (2016)
Files
Weber2016.pdf
Open Access - Adobe PDF
- 759.33 KB
Details
- Authors
- Abstract
- Knowledge of the electronic band structure of multiferroic oxides, crucial for the understanding and tuning of photoinduced effects, remains very limited even in the model and thoroughly studied BiFeO3. Here, we investigate the electronic band structure of BiFeO3 using Raman scattering with twelve different excitation wavelengths ranging from the blue to the near infrared. We show that resonant Raman signatures can be assigned to direct and indirect electronic transitions, as well as in-gap electronic levels, most likely associated with oxygen vacancies. Their temperature evolution establishes that the remarkable and intriguing variation of the optical band gap can be related to the shrinking of an indirect electronic band gap, while the energies for direct electronic transitions remains nearly temperature independent.
- Affiliations
Citations
Weber, M. C., Guennou, M., Toulouse, C., Cazayous, M., Gillet, Y., Gonze, X., & Kreisel, J. (2016). Temperature evolution of the band gap in BiFeO3 traced by resonant Raman scattering. Physical review. B, Condensed matter and materials physics, 93(12), 125204. https://doi.org/10.1103/PhysRevB.93.125204 (Original work published 2016)