Phys. Rev. B 70, 144505 (2004) [5 pages]Measurement of the current-phase relation of superconductor/ferromagnet/superconductor π Josephson junctions
S. M. Frolov and D. J. Van Harlingen
V. A. Oboznov, V. V. Bolginov, and V. V. Ryazanov Received 1 June 2004; published 13 October 2004 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. We find that the critical current of Nb-Cu0.47Ni0.53-Nb Josephson junctions with barrier thickness ∼22 nm changes sign at T<Tπ∼2–4 K , indicating that the junction becomes a π Josephson junction. We find no evidence for second-order Josephson tunneling near Tπ in the CPR predicted by several theories. ©2004 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevB.70.144505 [ Abstract | Previous article | Next article | Issue 14 ] |
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