Measurement of the current-phase relation of superconductor/ferromagnet/superconductor π Josephson junctions
S. M. Frolov, D. J. Van Harlingen, V. A. Oboznov, V. V. Bolginov, V. V. Ryazanov
DOI 10.1103/PhysRevB.70.144505 · Physical Review B
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Abstract
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 ∼22nm changes sign at T<Tπ∼2–4K, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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