Measurement of the Current-Phase Relation of SFS pi-Josephson junctions
Frolov, S. M. · Van Harlingen, D. J. · Oboznov, V. A. · Bolginov, V. V. · Ryazanov, V. V.
Original · EN
We present measurements of the current-phase relation (CPR) of Superconductor-Ferromagnet-Superconductor (SFS) Josephson junctions as a function of temperature. The CPR is determined by incorporating the junction into a superconducting loop coupled to a dc SQUID, allowing measurement of the junction phase difference. Junctions fabricated with a thin (22 nm) barrier of Cu0.47Ni0.53 sandwiched between Nb electrodes exhibit a re-entrant critical current with temperature, vanishing at T =Tₚi 2-4 K. We find that the critical current is negative for T < Tₚi, indicating that the junction is a pi-Josephson junction. We find no evidence for second-order Josephson tunneling near Tₚi in the CPR predicted by several theories.
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