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

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

2009-02-10

arxiv.org/abs/0902.1636v8

C. Gadermaier et al. Phys. Rev. Lett. 105, 257001 (2010)

Physics

Condensed Matter

Superconductivity

As published in PRL

Scientific paper

10.1103/PhysRevLett.105.257001

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\lambda<\omega^{2}>=800\pm200 meV^{2} for La_{1.85}Sr_{0.15}CuO_{4} and \lambda<\omega^{2}>=400\pm100 meV^{2} for YBa_{2}Cu_{3}O_{6.5}. These values suggest a possible fundamental role of the electron-phonon interaction in the superconducting pairing mechanism.

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