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Suggested experimental designs of Josephson -loops: epitaxial sandwich (left); rough sandwich (middle); single sample (right).
Calculated transport function, for the hole-doped (left panel) and electron-doped (right panel) BaFe2As2. Calculation for the electron-doped case was self-consistent in the virtual crystal approximation for the 10% Co doping and the rigid band approximation used around this composition. Similarly, the hole-doped composition was self-consistent for the 40% K doping and the rigid bands used thereafter.
Three suggested designs for probing the relative phases of the order parameter in Fe-based superconductors. A tunneling barrier here is assumed to be thick enough to filter through the “tunneling cone” effect only the states near the zone center (holes), while a point contact is supposed to collect current in all directions and thus be dominated by the majority carriers. The sign of the order parameter is selected in such a way that the current through the left (upper) contact is always considered positive.
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