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- W2290804581 abstract "We investigate the nonequilibrium insulator-metal transition driven in a $mathrm{SmNi}{mathrm{O}}_{3}$ thin film by coherent optical excitation of the $mathrm{LaAl}{mathrm{O}}_{3}$ substrate lattice. By probing the transient optical properties over a broad frequency range $(100ensuremath{-}800phantom{rule{0.16em}{0ex}}mathrm{c}{mathrm{m}}^{ensuremath{-}1})$, we analyze both the time-dependent metallic plasma and the infrared optical phonon line shapes. We show that the light-induced metallic phase in $mathrm{SmNi}{mathrm{O}}_{3}$ has the same carrier density as the equilibrium metallic phase. We also report that the $mathrm{LaAl}{mathrm{O}}_{3}$ 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 N'eel 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." @default.
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- W2290804581 date "2016-04-12" @default.
- W2290804581 modified "2023-09-25" @default.
- W2290804581 title "Broadband terahertz spectroscopy of the insulator-metal transition driven by coherent lattice deformation at the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>SmNi</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:mi>LaAl</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>interface" @default.
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- W2290804581 doi "https://doi.org/10.1103/physrevb.93.161107" @default.
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