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dc.contributor.authorKinha, Monuen_US
dc.contributor.authorPrajapati, G. L.en_US
dc.contributor.authorUdeshi, Malayen_US
dc.contributor.authorAgarwal, Piyushen_US
dc.contributor.authorRam, N. Bhargavaen_US
dc.contributor.authorRana, D. S.en_US
dc.identifier.citationKinha, M., Prajapati, G. L., Udeshi, M., Agarwal, P., Ram, N. B. & Rana, D. S. (2022). Ultrafast dynamical charge-lattice coupling in rare-earth nickelate thin films studied by time-resolved terahertz spectroscopy. Journal of Physics D: Applied Physics, 55(22), 225301-.
dc.description.abstractRare-earth nickelates exhibit a rich phase diagram formed by the complex interplay of intertwined and competing energetics of fundamental entities. To unwind the coupling and interaction mechanisms of fundamental entities underneath, time-resolved terahertz (THz) spectroscopy was implemented to understand non-equilibrium carrier and lattice dynamics of epitaxial thin films of La x Eu1-x NiO3 (x = 0, 0.25, 0.50, 1) systems, where x = 0 is insulating while remaining are metallic at room temperature. The THz transmittance of the insulating and metallic phases exhibit contrasting photo-induced phases associated with bi-exponential and mono-exponential relaxation mechanisms, respectively. A pronounced oscillatory feature superimposed on the mono-exponential relaxation manifests only in the metallic phase. As ascribed to the acoustic phonons, the 'x' dependent behavior of this feature reveals an inverse relation between the strength of electron-phonon coupling and the magnitude of conductivity. In the insulating state, in contrast, the relaxation time constants are associated with the recovery of charge-ordering and electron-phonon thermalization. This dynamical lattice-charge interaction study demonstrates use of this ultrafast phenomena in nickelate thin films in new generation ultrafast photo-acoustic devices as an alternate to conventional surface acoustic wave device.en_US
dc.relation.ispartofJournal of Physics D: Applied Physicsen_US
dc.rights© 2022 IOP Publishing Ltd. All rights reserved.en_US
dc.titleUltrafast dynamical charge-lattice coupling in rare-earth nickelate thin films studied by time-resolved terahertz spectroscopyen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.subject.keywordsRare-Earth Nickelatesen_US
dc.subject.keywordsAcoustic Phononsen_US
dc.description.acknowledgementD S R thanks the Science and Engineering Research Board (SERB), Department of Science and Technology, New Delhi, for financial support under research Project No. CRG/2020/002338.en_US
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