Current-phase relation in Nb-Al based SINIS-type Josephson junctions

Abstract

Il'ichev, Hans Eclthardt Hocnig, arid Hans-Gcorg Meyer A6struct-The supercurrent-phase relation (CPR) of Nb-A1 based Josephson elements of superconductor/insulator/ normal conductor/insulator/superconductor-type is deduced from impedance measurements of the phase-biased junction. The chosen temperature range from 1.9 to 8.0 K covers the superconducting transition of the aluminum interlayer below which a pronounced non-harmonic CPR is found. At temperatures higher than the corresponding critical temperature, the CPR did not deviate significantly from purely harmonic shape. Both results are in agreement with theoretical predictions. K~: / U J O T~S -Cryogenic electronics, Josephson junctions, impedance measurement.