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; D. Mihailovic

doi:10.1103/PhysRevLett.105.257001

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, D. Mihailovic

DOI 10.1103/PhysRevLett.105.257001 · Physical Review Letters

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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 λ⟨ω2⟩=800±200 meV2 for La1.85Sr0.15CuO4 and λ⟨ω2⟩=400±100 meV2 for YBa2Cu3O6.5. These values suggest a possible fundamental role of the electron-phonon interaction in the superconducting pairing mechanism.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60	Pressure not reported	unknown
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38	Pressure not reported	unknown