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Struct Dyn. 2018 Dec 6;5(6):064501. doi: 10.1063/1.5063530. eCollection 2018 Nov.

Dynamics of the photoinduced insulator-to-metal transition in a nickelate film.

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Photon Science Division, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan.
RIKEN SPring-8 Center, Hyogo 679-5148, Japan.
Science IT, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.


Material properties can be controlled via strain, pressure, chemical composition, or dimensionality. Nickelates are particularly susceptible due to their strong variations of the electronic and magnetic properties on such external stimuli. Here, we analyze the photoinduced dynamics in a single crystalline NdNiO3 film upon excitation across the electronic gap. Using time-resolved reflectivity and resonant x-ray diffraction, we show that the pump pulse induces an insulator-to-metal transition, accompanied by the melting of the charge order. Finally, we compare our results with similar studies in manganites and show that the same model can be used to describe the dynamics in nickelates, hinting towards a unified description of these photoinduced electronic ordering phase transitions.

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