Abstract
The superconducting gap is the fundamental parameter that characterizes the superconducting state, and its symmetry is a direct consequence of the mechanism responsible for Cooper pairing. Here we discuss about angle-resolved photoemission spectroscopy measurements of the superconducting gap in the Fe-based high-temperature superconductors. We show that the superconducting gap is Fermi surface dependent and nodeless with small anisotropy, or more precisely, a function of the momentum location in the Brillouin zone. We show that while this observation seems inconsistent with weak coupling approaches for superconductivity in these materials, it is well supported by strong coupling models and global superconducting gaps. We also suggest that a smaller lifetime of the superconducting Cooper pairs induced by the momentum dependent interband scattering inherent to these materials could affect the residual density of states at low energies, which is critical for a proper evaluation of the superconducting gap.
Highlights
The superconducting gap is the fundamental parameter that characterizes the superconducting state, and its symmetry is a direct consequence of the mechanism responsible for Cooper pairing
The SC gap of the Fe-based superconductors relies on the itinerancy of the electronic carriers and is mainly shaped by the Fermi surface (FS) topology and the properties in the vicinity of the FS, which varies from material to material
The SC pairing mechanism in the strong coupling approach is better described in the real space and the relevant energies are no longer limited to EF
Summary
The superconducting gap is the fundamental parameter that characterizes the superconducting state, and its symmetry is a direct consequence of the mechanism responsible for Cooper pairing. We show that the momentum distribution of the SC gap suggests that strong coupling approaches are more suitable to describe superconductivity in these materials.
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