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Femtosecond Response of Quasiparticles and Phonons in Superconducting YBa2Cu3O7-δ Studied by Wideband Terahertz Spectroscopy

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Pashkin, A. ; Porer, M. ; Beyer, M. ; Kim, K. W. ; Dubroka, A. ; Bernhard, C. ; Yao, X. ; Dagan, Y. ; Hackl, R. ; Erb, A. ; Demsar, J. ; Huber, Rupert ; Leitenstorfer, A.
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Date of publication of this fulltext: 28 Jan 2011 07:03


We measure the anisotropic midinfrared response of electrons and phonons in bulk YBa2Cu3O7-δ after femtosecond photoexcitation. A line shape analysis of specific lattice modes reveals their transient occupation and coupling to the superconducting condensate. The apex oxygen vibration is strongly excited within 150 fs, demonstrating that the lattice absorbs a major portion of the pump energy ...


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