Effect of Microwaves on the Current-Phase-Relation of diffusive SNS Junctions

We investigate the current-phase-relation (CPR) of long diffusive superconductor - normal metal - superconductor (SNS) Josephson junctions under microwave irradiation. The samples consist of narrow Ag bridges with a length between 300 and 500 nm inserted into a Nb loop by shadow evaporation on top of a mesoscopic Hall cross. Our Hall-sensors are based on high mobility GaAs/AlGaAs- heterostructures. They directly detect the magnetic response of the loop to an external magnetic field, from which the full CPR can be reconstructed. The measurements are done in the high-temperature regime $E_{Th}