01.11.2016; Kolloquium
Physikalisches Kolloquium Andersen
(Niels Bohr Institute, Copenhagen)
01062 Dresden
Recent developments in iron-based superconductors; orbital selectivity, gap structure, and induced order
I will briefly review the status of high-Tc superconductivity, and discuss some open questions in the field. Then I turn to recent developments of iron-based superconductors and progress in the quest for a quantitative description of these materials. I will focus initially on the superconducting properties of FeSe which is a material of significant current interest due to its highly tunably superconducting critical temperature. I will discuss the gap structure of FeSe and how a proper modelling necessarily includes the role of important correlation effects. We will discuss how these studies (of FeSe) has led to new insight to other iron pnictides as well. Next, I will discuss a number of unusual Tc- suppression rates as a function of disorder in correlated superconductors. This is a topic of great current interest, and I will present our recent theoretical studies of both single- and multi-band superconductors and relate to recent experiments.