Electron-phonon coupling in 122 Fe pnictides analyzed by femtosecond time-resolved photoemission

Abstract

Based on results from femtosecond time-resolved photoemission, we compare three different methods for determination of the electron-phonon coupling constant λ in Eu and Ba-based 122 FeAs compounds. We find good agreement between all three methods, which reveal a small λ < 0.2. This makes simple electron-phonon mediated superconductivity unlikely in these compounds.

11 pages, 3 figures

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• Ultrafast structural dynamics of the Fe-pnictide parent compound BaFe2As2
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• Coupling of the A_{1g} As-phonon to magnetism in iron pnictides
• Role of matrix elements in the time-resolved photoemission signal
• Ultrafast destruction and recovery of the spin density wave order in iron based pnictides: a multi-pulse optical study
• Constraints on the total coupling strength to bosons in iron based superconductors
• Electronic structure and ultrafast dynamics of FeAs-based superconductors by angle- and time-resolved photoemission spectroscopy
• Doping dependence and electron-boson coupling in the ultrafast relaxation of hot electron populations in Ba(Fe_{1-x}Co_x)_2As_2
• Properties and challenges of hot-phonon physics in metals: MgB${}_2$ and other compounds