Electron-Phonon Coupling in High-Temperature Cuprate Superconductors Determined from Electron Relaxation Rates

C. Gadermaier, A. S. Alexandrov, V. V. Kabanov, P. Kusar, T. Mertelj, X. Yao, C. Manzoni, D. Brida, G. Cerullo, and D. Mihailovic
Phys. Rev. Lett. 105, 257001 – Published 13 December 2010
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Abstract

We determined electronic relaxation times via pump-probe optical spectroscopy using sub-15 fs pulses for the normal state of two different cuprate superconductors. We show that the primary relaxation process is the electron-phonon interaction and extract a measure of its strength, the second moment of the Eliashberg function λω2=800±200meV2 for La1.85Sr0.15CuO4 and λω2=400±100meV2 for YBa2Cu3O6.5. These values suggest a possible fundamental role of the electron-phonon interaction in the superconducting pairing mechanism.

  • Figure
  • Received 6 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.105.257001

© 2010 The American Physical Society

Authors & Affiliations

C. Gadermaier1,*, A. S. Alexandrov2,1, V. V. Kabanov1, P. Kusar1, T. Mertelj1, X. Yao3, C. Manzoni4, D. Brida4, G. Cerullo4, and D. Mihailovic1

  • 1Department of Complex Matter, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
  • 2Department of Physics, Loughborough University, Loughborough LE11 3TU, United Kingdom
  • 3Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China
  • 4National Laboratory for Ultrafast and Ultraintense Optical Science, INFM-CNR, Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy

  • *To whom all correspondence should be addressed. christoph.gadermaier@ijs.si

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Vol. 105, Iss. 25 — 17 December 2010

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