[en] The pressure dependence of light-induced effects in single-crystalline BiFeO3 is studied by optical spectroscopy. At low pressures, we observe three light-induced absorption features with energies just below the two crystal-field excitations and the absorption onset, respectively. These absorption features were previously ascribed to excitons, possibly connected with the ultrafast photostriction effect in BiFeO3. The pressure-induced redshift of the absorption features follows the pressure dependence of the corresponding crystal-field excitations and absorption onset, suggesting the link between them. Above the structural phase transition at P-c1 approximate to 3.5 GPa, the three absorption features disappear, suggesting their connection to the polar phase in BiFeO3. The pressure-induced disappearance of the photoinduced features is irreversible upon pressure release. Published under license by AIP Publishing.
Disciplines :
Physics
Author, co-author :
Meggle, F.
Ebad-Allah, J.
Kreisel, Jens ; University of Luxembourg > CRC > Vice-rectorate for Research (VR Research)
Kuntscher, C. A.
External co-authors :
yes
Language :
English
Title :
Optical spectroscopy on the photo-response in multiferroic BiFeO3 at high pressure