ABSTRACT

In this chapter, we review recent progress in angle-resolved

photoemission spectroscopy (ARPES) studies of iron-pnictide su-

perconductors, by particularly focusing on the experimental results

on the BaFe2As2 system where the ARPES investigations have

been most intensively performed. We discuss (i) the evolution

of the Fermi surface topology upon electron-and hole-carrier

doping, (ii) the superconducting-gap symmetry, (iii) the many-body

interactions, and (iv) the electronic states in the antiferromagnetic

phase of a parent compound, as well as their implications to the

mechanism of superconductivity.