Journal article

Femtosecond response of quasiparticles and phonons in superconducting YBa₂Cu₃O7-δ studied by wideband terahertz spectroscopy

  • Pashkin, A. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
  • Porer, M. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
  • Beyer, M. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
  • Kim, Kyung Wan Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - Department of Physics, University of Fribourg, Switzerland
  • Dubroka, Adam Department of Physics, University of Fribourg, Switzerland
  • Bernhard, Christian Department of Physics, University of Fribourg, Switzerland
  • Yao, X. Department of Physics, Shanghai Jiao Tong University, Shanghai, China
  • Dagan, Y. Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Israel
  • Hackl, R. Walther-Meissner-Institut, Garching, Germany
  • Erb, A. Walther-Meissner-Institut, Garching, Germany
  • Demsar, J. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - Complex Matter Department, Jozef Stefan Institute, Ljubljana, Slovenia
  • Huber, R. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
  • Leitenstorfer, A. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
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    02.08.2010
Published in:
  • Physical Review Letters. - 2010, vol. 105, no. 6, p. 067001
English 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 before the quasiparticles are thermalized. Our results attest to substantial electron-phonon scattering and introduce a powerful concept probing electron-lattice interactions in a variety of complex materials.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
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https://folia.unifr.ch/unifr/documents/301732
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