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Regular version of the site

Working paper

Second-Harmonic Current-Phase Relation in Josephson Junctions with Ferromagnetic Barriers

cond-mat, 2018. No. 1805.12546.
Stoutimore M. J., Rossolenko A. N., Bolginov V. V., Oboznov V. A., Rusanov A. Y., Baranov D. S., Pugach N., Frolov S. M., Ryazanov V. V., Van Harlingen D. J.
We report the observation of a current-phase relation dominated by the second Josephson harmonic in superconductor-ferromagnet-superconductor junctions. The exotic current-phase relation is realized in the vicinity of a temperature-controlled 0-to-π junction transition, at which the first Josephson harmonic vanishes. Direct current-phase relation measurements, as well as Josephson interferometry, non-vanishing supercurrent and half-integer Shapiro steps at the 0-π transition selfconsistently point to an intrinsic second harmonic term, making it possible to rule out common alternative origins of half-periodic behavior. While surprising for diffusive multimode junctions, the large second harmonic is in agreement with theory predictions for thin ferromagnetic interlayers.