Iron-based superconductors are well known for their complex interplay between structure,
magnetism and superconductivity. FeSe offers a particularly fascinating example. This …

Understanding the electron pairing in hole-doped cuprate superconductors has been a
challenge, in particular because the “normal” state from which it evolves is unprecedented …

The superconductor iron selenide (FeSe) is of intense interest owing to its unusual
nonmagnetic nematic state and potential for high-temperature superconductivity. But its …

I review theoretical ideas and implications of experiments for the gap structure and symmetry
of the Fe-based superconductors. Unlike any other class of unconventional …

The development of sensible microscopic models is essential to elucidate the normal-state
and superconducting properties of the iron-based superconductors. Because these …

Almost a decade has passed since the serendipitous discovery of the iron-based high
temperature superconductors (FeSCs) in 2008. The fact that, as in the copper oxide high …

A large anisotropy in the electronic properties across a structural transition in several
correlated systems has been identified as the key manifestation of electronic nematic order …

We review the recent developments in electronic Raman scattering measurements of charge
nematic fluctuations in iron-based superconductors. A simple theoretical framework of a d …

We discuss the influence on spin-fluctuation pairing theory of orbital selective strong
correlation effects in Fe-based superconductors, particularly Fe chalcogenide systems. We …

Hund metals are multi-orbital systems with moderate Coulomb interaction, U, among
charges and sizeable Hund's rule coupling, J (< U), that aligns the spins in different orbitals …