I will present measurements of the Josephson Effect between a conventional s-wave superconductor and a Fe-pnictide superconductor and between an electron-doped and hole-doped Fe- pnictide superconductor. Shapiro steps and magnetic diffraction patterns are observed for Josephson tunneling in the c-axis direction of single crystals in both cases. These results prove that an s-wave component must be present in the pairing symmetry of Fe-pnictide superconductors. Implications for novel types of s-wave pairing will be discussed.

This work is done in collaboration with Xiaohang Zhang and Ichiro Takeuchi at UMD and several groups of crystal providers.