Temperature-dependent photo-response in multiferroic BiFeO${}_3$ revealed by transmission measurements

Abstract

We studied the light-induced effects in BiFeO${}_3$ single crystals as a function of temperature by means of optical spectroscopy. Here we report the observation of several light-induced absorption features, which are discussed in terms of the photostriction effect and are interpreted in terms of excitons. The temperature dependence of their energy position suggests a possible coupling between the excitons and the lattice vibrations. Moreover, there are hints for anomalies in the temperature evolution of the excitonic features, which might be related to the temperature-induced magnetic phase transitions in BiFeO${}_3$. Our findings suggest a coupling between light-induced excitons and the lattice and spin degrees of freedom, which might be relevant for the observed ultrafast photostriction effect in multiferroic BiFeO${}_3$.

7 pages, 6 figures

References in corpus (6)

• First-principles study of spontaneous polarization in multiferroic BiFeO${}_3$
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Cited by in corpus (1)

• Optical spectroscopy on the photo-response in multiferroic BiFeO${}_3$ at high pressure