Subpicosecond time-resolved studies of coherent phonon oscillations in thin-film YBa2Cu3O6+x (x0.4)
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چکیده
We report the results of the first time-resolved observation of impulsively generated coherent optical phonon oscillations in the semiconducting cuprate compound YBa,Cu,O, +x (x < 0.4). The oscillations, which were probed through time-resolved transmissivity modulation, had a period of 237 fs at room temperature, corresponding to a Raman active mode of A ig symmetry at 142 cm ‘. No oscillations were observed in the superconducting form of Y-Ba-Cu-0 either above or below T,. The amplitude, frequency, and linewidth of this mode were measured over a temperature range from -7 K to room temperature.
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تاریخ انتشار 2000