University of St Andrews

I will overview our recent results on some key members of iron-based family of superconductors.  Majority of these materials undergo or are close to a tetragonal-to-orthorhombic (nematic) transition which seems to be of electronic origin. It is currently highly debated whether the nematic fluctuations are so important that they can mediate the pairing itself. On the other hand, there is a controversy as to how strong the influence of the nematic ordering on the electronic structure probed by ARPES is, thus questioning the direct relation between nematicity and superconductivity. Intriguingly, it may actually appear that the latter drives the former.