Evidence for two-gap superconductivity in (Ba,K)Fe_2As_2 by directional point contact Andreev reflection spectroscopy

P. Szabo, Z. Pribulova, G. Pristas +3

Directional point-contact Andreev-reflection spectroscopy measurements on the Ba${}_{0.55}$K${}_{0.45}$Fe${}_2$As${}_2$ single crystals are presented. The spectra show significant differen…