Anomalous phonon redshift in K-doped BaFe2As2 iron pnictides

B. Xu, Y. M. Dai, B. Shen +9

The effect of K, Co and P dopings on the lattice dynamics in the BaFe${}_2$As${}_2$ system is studied by infrared spectroscopy. We focus on the phonon at $\sim$ 253 cm${}^{-1}$, the high…