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 …

This article reviews theoretical and experimental work on the novel physics in multiband
superconductors. Multiband superconductors are characterized by multiple superconducting …

We investigate how emergent nematic order and nematic fluctuations affect several
macroscopic properties of both the normal and superconducting states of the iron pnictides …

We analyze the evolution of the superconducting gap structure in strongly hole-doped Ba 1−
x K x Fe 2 As 2 between x= 1 and x∼ 0.4 (optimal do**). In the latter case, the pairing …

We construct the symmetry adapted low-energy effective Hamiltonian for the electronic
states in the vicinity of the Fermi level in iron-based superconductors. We use Luttinger's …

In several families of iron-based superconducting materials, ad-wave pairing instability may
compete with the leading s-wave instability. Here, we show that when both states have …

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 …

Nematic phases, in which electrons in a solid spontaneously break rotational symmetry
while preserving translational symmetry, exist in several families of unconventional …

We analyze the pairing symmetry in Fe-based superconductors A Fe 2 Se 2 (A= K, Rb, Cs)
which contain only electron pockets. We argue that the pairing condensate in such systems …

The BCS theory of superconductivity named electron-phonon interaction as a glue that
overcomes Coulomb repulsion and binds fermions into pairs which then condense and …