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Temperature dependence of relaxation dynamics of UX$_{3}$ (X = Al, Ga, Sn)compounds is studied using time resolved pump-probe technique in thereflectance geometry. UGa$_{3}$ is an itinerant antiferromagnet, whileUAl$_{3}$ and USn$_{3}$ are spin fluctuation systems. For UGa$_{3}$, our dataare consistent with the formation of a spin density wave SDW gap as evidencedfrom the quasidivergence of the relaxation time $\tau$ near the N\'{e}eltemperature $T_{N}$. For UAl$_{3}$ and USn$_{3}$, the relaxation dynamics showsa change from single exponential to two exponential behavior below a particulartemperature, suggestive of coherence formation of the 5\textit{f} electronswith the conduction band electrons. This particular temperature can beattributed to the spin fluctuation temperature $T_{sf}$, a measure of thestrength of Kondo coherence. Our $T_{sf}$ is consistent with other data such asresistivity and susceptibility measurements. The temperature dependence of therelaxation amplitude and time of UAl$_{3}$ and USn$_{3}$ were also fitted bythe Rothwarf-Taylor model. Our results show ultrafast optical spectroscopy issensitive to c-\textit{f} Kondo hybridization in the \textit{f}-electronsystems.

Coherent energy scale revealed by ultrafast dynamics of UX$_{3}$ (X=Al, Sn, Ga) single crystals