Figure 3

(a) \(I-V\) characteristics of a \({\hbox {Pb}_{0.6}\hbox {In}_{0.4}}\)/\(\hbox {Ba}_{0.6}\hbox {K}_{0.4}\hbox {(FeAs)}_2\) point-contact Josephson junction, recorded in zero magnetic and zero microwave fields at different temperatures. (b) Symbols: measured normalized critical currents \(I_c (T)\)/\(I_c (0)\) as a function of the normalized temperature T/\(T_c\) for a PC with a current injection along the ab plane (blue stars) and for a contact with current along the c-axis (red circles). Lines: theoretical dependencies for (1) an Ambegaokar–Baratoff (AB)³⁶ S/I/S tunnel contact between “ordinary” superconductors (black, solid), (2) contacts with current injection parallel to the ab plane between an “ordinary” S and a two-band \(s \pm\) superconductor¹⁵ in the case of a direct microshort (solid line, violet) and a tunnel contact (line and crosses, blue) and (3) for Kulik–Omelyanchuk (KO1) dirty S/S microshorts³⁷ (red dashed line).