Influence of the Fermi surface geometry on the Josephson effect between iron-pnictide and conventional superconductors
Influence of the Fermi surface geometry on the Josephson effect between iron-pnictide and conventional superconductors
We study Josephson junctions between a multi-band iron-pnictide Ba1-xNaxFe2As2 and conventional s-wave superconductors Nb and Cu/Nb bilayer. We observe that junctions with a Cu interlayer exhibit much larger IcRn, despite a weaker proximity-induced superconductivity. This counterintuitive result is attributed to the difference in Fermi surface geometries of Nb and Cu, …