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We report measurements of quasiparticle relaxation dynamics in thehigh-temperature superconductor (Ba,K)Fe$_{2}$As$_{2}$ in optimally doped,underdoped and undoped regimes. In the underdoped sample, spin-density wave(SDW) order forms at $\sim$85 K, followed by superconductivity at $\sim$ 28 K.We find the emergence of a normal-state order that suppresses SDW at atemperature $T^{\ast} \sim$ 60 K and argue that this normal-state order is aprecursor to superconductivity.

Ultrafast pump-probe study of phase separation and competing orders in the underdoped (Ba,K)Fe$_{2}$As$_{2}$ superconductor