ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism

Abstract

Its direct momentum sensitivity confers to angle-resolved photoemission spectroscopy (ARPES) a unique perspective in investigating the superconducting gap of multi-band systems. In this review we discuss ARPES studies on the superconducting gap of the high-temperature Fe-based superconductors. We show that while Fermi-surface-driven pairing mechanisms fail to provide a universal scheme for the Fe-based superconductors, theoretical approaches based on short-range interactions lead to a more robust and universal description of superconductivity in these materials. Our findings are also discussed in the broader context of unconventional superconductivity.

Topical review. 48 pages, 15 figures

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• Observation of Open-Orbit Fermi Surface Topology in Extremely Large Magnetoresistance Semimetal MoAs${}_2$
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• Emergent vortex Majorana zero mode in iron-based superconductors
• Searching for Majorana quasiparticles at vortex cores in iron-based superconductors
• Spectroscopic evidence of high temperature superconductivity in VSe2
• Superconductivity and phonon self-energy effects in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$
• Interband scattering- and nematicity-induced quantum oscillation frequency in FeSe
• Ion-selective scattering studied by the variable-energy electron irradiation of Ba${}_{0.2}$K${}_{0.8}$Fe${}_2$As${}_2$ superconductor