Fe-based superconductors from an ab initio prespective

First principles methods combined with many-body techniques have played an important role in unveiling the microscopic origin of the electronic properties of Fe-based superconductors.
In this talk, I will discuss correlations, magnetism, superconductivity and influence of pressure and doping effects in Fe pnictides and chalcogenides from an ab initio prespective and will examine achievements and failures of such an approach.
I will present recent results on FeSe and the newly discovered CaKFe4As4 and argue about challenges and opportunities in this field after 10 years of Fe-based superconductors.