Non-Fermi-liquid scattering rates and anomalous band dispersion in ferropnictides

Abstract

Angle-resolved photoemission spectroscopy (ARPES) is used to study the band dispersion and the quasiparticle scattering rates in two ferropnictides systems. Our ARPES results show linear-in-energy dependent scattering rates which are constant in a wide range of control parameter and which depend on the orbital character of the bands. We demonstrate that the linear energy dependence gives rise to weakly dispersing band with a strong mass enhancement when the band maximum crosses the chemical potential. In the superconducting phase the related small effective Fermi energy favors a Bardeen-Cooper-Schrieffer (BCS)\,\cite{Bardeen1957}-Bose-Einstein (BE)\,\cite{Bose1924} crossover state.

5 pages, 4 figures Supplement 4 pages, 6 figures

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Cited by in corpus (19)

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• Orbital mismatch boosting nematic instability in iron-based superconductors
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• Evidence of hot and cold spots on the Fermi surface of LiFeAs
• Experimental evidence for the importance of Hund's exchange interaction for the incoherence of the charge carriers in iron-based superconductors
• ARPES view of orbitally resolved quasiparticle lifetimes in iron pnictides
• Observation of a remarkable reduction of correlation effects in BaCr2As2 by ARPES
• Topological magnetic order and superconductivity in EuRbFe${}_4$As${}_4$
• Ru-doping on iron based pnictides: the "unfolded" dominant role of structural effects for superconductivity
• Linkage between scattering rates and superconductivity in doped ferropnictides
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• Strong spin dependence of correlation effects in Ni due to Stoner excitations
• Doping dependence and electron-boson coupling in the ultrafast relaxation of hot electron populations in Ba(Fe_{1-x}Co_x)_2As_2
• Probing a Bose Metal via Electrons: Inescapable non-Fermi liquid scattering and pseudogap physics
• Orbital-dependent electron dynamics in Fe-pnictide superconductors