Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 20: Multiferroics and Magnetoelectric coupling I (joint session MA/KFM)
MA 20.6: Talk
Tuesday, April 2, 2019, 15:30–15:45, H37
Temperature- and pressure-dependent optical measurements on the photo-response in multiferroic BiFeO3 — •Fabian Meggle1, Jihaan Ebad-Allah1,2, Michel Viret3, Jens Kreisel4,5, and Christine Kuntscher1 — 1Experimentalphysik II, Universität Augsburg, 86159 Augsburg, Germany — 2Department of Physics, Tanta University, 31527 Tanta, Egypt — 3Service de Physique de l’État Condenseé, SPEC, CEA Saclay, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette, France — 4Physics and Materials Science Research Unit, University of Luxembourg, 4422 Belvaux, Luxembourg — 5Department Materials Research and Technology, Luxembourg Institute of Science and Technology, 41 Rue du Brill, 4422 Belvaux, Luxembourg
BiFeO3 exhibits three absorption features in the optical transmission spectrum between 1.0 and 2.2 eV during laser illumination.1 These features were ascribed to excitons, which are proposed to be relevant for the ultrafast photostriction effect in BiFeO3.2 We studied the impact of low temperature and high pressure on the photo-induced features by using optical spectroscopy. Our temperature-dependent findings suppose a possible coupling between absorption features and lattice vibrations, whereas the spin degree of freedom might be also involved. The pressure-dependent measurements show a vanishing of the absorption features above 3.5 GPa, where BiFeO3 is reported to undergo a phase transition from polar to a non-ferroelectric phase.3 1Burkert et al., Appl. Phys. Lett. 109, 182903 (2016); 2Schick et al., Phys. Rev. Lett. 112, 97602 (2014); 3Belik et al., Chem. Mater. 21, 3400 (2009)