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Broadband terahertz spectroscopy of the insulator-metal transition driven by coherent lattice deformation at the SmNiO3/LaAlO3 interface

MPS-Authors
/persons/resource/persons133793

Hu,  Wanzheng
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, 22761 Hamburg, Germany;

/persons/resource/persons133811

Cavalleri,  Andrea
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, 22761 Hamburg, Germany;
Department of Physics, Clarendon Laboratory, University of Oxford, OX1 3PU Oxford, United Kingdom;

Fulltext (public)

1602.09026.pdf
(Preprint), 326KB

PhysRevB.93.161107.pdf
(Publisher version), 679KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Hu, W., Catalano, S., Gibert, M., Triscone, J.-.-M., & Cavalleri, A. (2016). Broadband terahertz spectroscopy of the insulator-metal transition driven by coherent lattice deformation at the SmNiO3/LaAlO3 interface. Physical Review B, 93(16): 161107. doi:10.1103/PhysRevB.93.161107.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-1E4C-2
Abstract
We investigate the nonequilibrium insulator-metal transition driven in a SmNiO3 thin film by coherent optical excitation of the LaAlO3 substrate lattice. By probing the transient optical properties over a broad frequency range (100 - 800 cm-1), we analyze both the time-dependent metallic plasma and the infrared optical phonon line shapes. We show that the light-induced metallic phase in SmNiO3 has the same carrier density as the equilibrium metallic phase. We also report that the LaAlO3 substrate acts as a transducer only at the earlier time delays, as the vibrations are driven coherently. No long-lived structural rearrangement takes place in the substrate. Finally, we show that the transient insulator-metal transition occurs both below and above the Néel temperature. We conclude that the supersonic melting of magnetic order measured with ultrafast x rays is not the driving force of the formation of the metallic phase. We posit that the insulator-metal transition may origin from the rearrangement of ordered charges at the interface propagating into the film.