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- W2055722080 abstract "We report the observation of coherent optical phonons at 120 and 150 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ in superconducting ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ (ensuremath{delta}0.1) thin films. These phonons are excited by femtosecond laser pulses and observed by distinct oscillations of the reflectivity signal in real time. Below the transition temperature ${mathit{T}}_{mathit{c}}$ the amplitude of the Ba mode at 120 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ increases drastically in close correlation to the density of optically excited quasiparticles. The dephasing times of the coherent Ba and Cu(2) vibrations exhibit sharp increases below ${mathit{T}}_{mathit{c}}$ excluding a ``second'' smaller gap below 150 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$." @default.
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- W2055722080 title "Time-resolved observation of coherent phonons in superconducting<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></…" @default.
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- W2055722080 doi "https://doi.org/10.1103/physrevlett.69.1451" @default.
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