Ultrafast Electron Relaxation in Superconducting Bi2Sr2CaCu2O8+δ by Time-Resolved Photoelectron Spectroscopy

L. Perfetti; P. A. Loukakos; M. Lisowski; U. Bovensiepen; H. Eisaki; M. Wolf

doi:10.1103/PhysRevLett.99.197001

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Ultrafast Electron Relaxation in Superconducting Bi2Sr2CaCu2O8+δ by Time-Resolved Photoelectron Spectroscopy

L. Perfetti, P. A. Loukakos, M. Lisowski, U. Bovensiepen, H. Eisaki, M. Wolf

DOI 10.1103/PhysRevLett.99.197001 · Physical Review Letters

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Abstract

Time-resolved photoelectron spectroscopy is employed to study the dynamics of photoexcited electrons in optimally doped Bi2Sr2CaCu2O8+δ (Bi-2212). Hot electrons thermalize in less than 50 fs and dissipate their energy on two distinct time scales (110 fs and 2 ps). These are attributed to the generation and subsequent decay of nonequilibrium phonons, respectively. We conclude that 20% of the total lattice modes dominate the coupling strength and estimate the second momentum of the Eliashberg coupling function λΩ02=360±30 meV2. For the typical phonon energy of copper-oxygen bonds (Ω0≃40–70 meV), this results in an average electron-phonon coupling λ<0.25.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure unresolved	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown