Ultrafast generation and detection of propagating coherent acoustic phonon wave packets in ultra-thin iron pnictide films

D. Cheng, B. Song, J. H. Kang +9

We observe pronounced oscillations in differential reflectivity of 9 nm and 60 nm BaFe\textsubscript{2}As\textsubscript{2} (Ba-122) thin films using ultrafast optical spectroscopy.…