  To investigate the transport properties of iron based superconductors, we
prepared planar hybrid superconductor-normal metal-superconductor (SNS') thin
film junctions with BaFe1.8Co0.2As2 as base electrode. As counter electrode we
used a lead indium alloy, while the normal metal layer was formed by thin gold
films. Temperature dependent measurements of the electrical conductivity were
strongly influenced by the properties of the electrodes. We developed a
junction structure that allows us to characterize the electrodes, too,
including the behavior of their normal state resistance in order to correct
their influences on the conduction spectra. The corrected conductivity of the
junction was described within an extended BTK-model and shows a behavior
dominated by Andreev reflexion.
