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

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