Photoinduced excited-state dynamics in Co-doped BaFe 2 As 2 superconducting films

The nonlinear optical dynamics and structural transformation of Co-doped BaFe 2 As 2 superconducting films demonstrate complex behavior within a broad range of temperatures. The angle-resolved light scattering conoscopy reveals the temperature-dependent structural transformation of the optimally doped BaFe 2 As 2 . Photoinduced excited states dynamics demonstrate the instantaneous formation of the nonequilibrium state of quasiparticles with its subsequent multi-step thermalization within several picoseconds. These transient processes show noticeable temperature dependence below superconducting transition point T c , where photoinduced dynamics correlate with the surface morphology. Graphical abstract