Open AccessSubpicosecond time-resolved studies of coherent phonon oscillations in thin-film YBa2Cu3O6+x (x<0.4)
Author(s) -
James M. Chwalek,
Ctirad Uher,
J.F. Whitaker,
G. Mourou,
John A. Agostinelli
Publication year - 1991
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.104462
Subject(s) - phonon , cuprate , laser linewidth , superconductivity , condensed matter physics , raman spectroscopy , atmospheric temperature range , thin film , amplitude , materials science , atomic physics , chemistry , physics , optics , laser , nanotechnology , meteorology
We report the results of the first time‐resolved observation of impulsively generated coherent optical phonon oscillations in the semiconducting cuprate compound YBa2Cu3O6+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 A1g symmetry at 142 cm−1. No oscillations were observed in the superconducting form of Y‐Ba‐Cu‐O either above or below Tc. The amplitude, frequency, and linewidth of this mode were measured over a temperature range from ∼7 K to room temperature