  To investigate the properties of iron-based superconductors, we examined
different kinds of Josephson junctions using Co-doped Ba-122 thin films. Based
on bicrystalline SrTiO3 substrates we prepared grain boundary (GB) junctions,
which showed clear Josephson effects. We present electrical measurements at
varying temperatures and magnetic fields. Furthermore, we prepared hybrid
junctions using thin film technique. Confined by a Ba-122 base electrode (S)
and a PbIn counter electrode (S') two different geometries of hybrid junctions
are formed: a planar SNS' junction with a gold barrier (N) in between and an
edge-type junction with an interface-engineered barrier. All three kinds of
junctions showed asymmetric resistively shunted junction-like (RSJ) behavior
with ICRN products of 20.2 /mu V (GB junctions), 18.4 /mu V (planar SNS'
junctions) and 12.3 /mu V (edge-type junctions), respectively. An excess
current could be observed at all junctions.
