Josephson interferometry and Shapiro step measurements of superconductor-ferromagnet-superconductor 0−π junctions
S. M. Frolov, D. J. Van Harlingen, V. V. Bolginov, V. A. Oboznov, V. V. Ryazanov
DOI 10.1103/PhysRevB.74.020503 · Physical Review B
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Abstract
We report the observation of the 0−π junction state in superconductor-ferromagnet-superconductor Josephson junctions arising from variations in the effective barrier thickness d∕ξF. By varying the temperature, the junctions can be tuned from the 0- to the π-state through an intermediate regime in which parts of the junction are in each state. A signature of the 0−π regime is that the usual peak in the critical current diffraction pattern at zero magnetic field becomes a dip, evidence for sign changes in the critical current density. In some junctions, the zero-field critical current does not vanish at any temperature and half-integer Shapiro steps are observed, indicating the presence of spontaneous supercurrents circulating within the junctions around the 0−π interfaces.
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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