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Ultrafast terahertz (THz) pump{probe spectroscopy reveals unusualout-of-equilibrium Cooper pair dynamics driven by femtosecond (fs) opticalquench of superconductivity (SC) in iron pnictides. We observe a two{stepquench of the SC gap, where an abnormally slow (many 100's of ps) quenchprocess is clearly distinguished from the usual fast (sub-ps)hot{phonon{mediated scattering channel. This pair breaking dynamics dependsstrongly on doping, pump uence, and temperature. The above observations,together with quantum kinetic modeling of non-equilibrium SC and magneticcorrelations, provide evidence for photogeneration of a transient state whereSC competes with build{up of spin-density-wave (SDW) excitonic correlationbetween quasi-particles (QP).

Non-equilibrium Pair Breaking in Ba(Fe1-xCox)2As2 Superconductors: Evidence for Formation of Photo-Induced Excitonic Spin-Density-Wave State