Superconducting gap in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ from temperature dependent transient optical reflectivity

A. Pogrebna, T. Mertelj, Z. R. Ye +2

Temperature and fluence dependence of the 1.55-eV optical transient reflectivity in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ was measured and analysed in the low and high excitation den…