Abstract
In this study, we have performed time-resolved terahertz (THz) spectroscopic (TRTS) measurements on rare-earth nickelates thin films of different electronic states. While insulating film EUNiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> (ENO) shows insulator-metal phase transition on increasing the optical pump fluence, metallic film La <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.25</inf> Eu <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.75</inf> NiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> (L25ENO) shows contrasting behavior with superposition of acoustic phonon modulations to transient THz transmission. In the case of the insulating ENO film, two relaxation time constants were ascribed as electron-phonon thermalization and the recovery of charge ordering, while for the metallic films, only one relaxation time constant was obtained. Based on these contrasting features, insulating and metallic films can be contemplated as an ultrafast optical switch and ultrafast photo-acoustic devices, respectively.
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