Fe-based superconductors: an angle-resolved photoemission spectroscopy perspective

TL;DR

This paper reviews how angle-resolved photoemission spectroscopy (ARPES) has been used to study the electronic structure, Fermi surface, and superconducting gap of Fe-based superconductors, highlighting its reliability and insights gained.

Contribution

It provides a comprehensive overview of ARPES studies on Fe-based superconductors, emphasizing the technique's effectiveness in characterizing their electronic properties.

Findings

ARPES reliably characterizes Fermi surface topology.

Superconducting gaps are consistently observed across compositions.

Electronic structure insights support multiband superconductivity.

Abstract

Angle-resolved photoemission spectroscopy allows direct visualization and experimental determination of the electronic structure of crystals in the momentum space, including the precise characterization of the Fermi surface and the superconducting order parameter. It is thus particularly suited for investigating multiband systems such as the Fe-based superconductors. In this review, we cover several aspects of these recently discovered materials that have been addressed by this technique, with a special emphasis on their superconducting gap and their Fermi surface topology. We provide sufficient experimental evidence to support the reliability and the consistency of the angle-resolved photoemission spectroscopy measurements over a wide range of material compositions.