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We systematically investigate the photoexcited (PE) quasi-particle (QP)relaxation and low-energy electronic structure in electron dopedBa(Fe_{1-x}Co_{x})_{2}As_{2} single crystals as a function of Co doping, 0<= x<=0.11. The evolution of the photoinduced reflectivity transients with $x$proceeds with no abrupt changes. In the orthorhombic spin-density-wave (SDW)state a bottleneck associated with a partial charge-gap opening is detected,similar to previous results in different SDW iron-pnictides. The relativecharge gap magnitude decreases with increasing x. In the superconducting (SC)state an additional relaxational component appears due to a partial (orcomplete) destruction of the SC state proceeding on a sub-0.5-picosecondtimescale. From the SC component saturation behavior the optical SC-statedestruction energy, U_p/k_B=0.3 K/Fe, is determined near the optimal doping.The subsequent relatively slow recovery of the SC state indicates clean SCgaps. The T-dependence of the transient reflectivity amplitude in the normalstate is consistent with the presence of a pseudogap in the QP density ofstates. The polarization anisotropy of the transients suggests that thepseudogap-like behavior might be associated with a broken point symmetryresulting from nematic electronic fluctuations persisting up to T~200 K at anyx. The second moment of the Eliashberg function, obtained from the relaxationrate in the metallic state at higher temperatures, indicates a moderateelectron phonon coupling, lambda <~0.3, that decreases with increasing doping.

physical review. b, condensed matter and materials physics

Doping dependence of femtosecond quasi-particle relaxation dynamics in  Ba(Fe,Co)_2As_2 single crystals: possible evidence for normal state nematic  fluctuations