Raman-Scattering Detection of Nearly Degenerate $s$-Wave and $d$-Wave Pairing Channels in Iron-Based Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ and Rb${}_{0.8}$Fe${}_{1.6}$Se${}_2$ Superconductors

Florian Kretzschmar, Bernhard Muschler, Thomas Böhm +6

We show that electronic Raman scattering affords a window into the essential properties of the pairing potential $V_{\mathbf{k},{\mathbf{k}}^{\prime }}$ of iron-based superconductors.…