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

M. J.A. Stoutimore, A. N. Rossolenko, V. V. Bolginov, V. A. Oboznov, A. Y. Rusanov, D. S. Baranov, N. Pugach, S. M. Frolov, V. V. Ryazanov, D. J. Van Harlingen

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Abstract

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, nonvanishing supercurrent and half-integer Shapiro steps at the 0-π transition self-consistently 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.

Original languageEnglish (US)
Article number177702
JournalPhysical review letters
Volume121
Issue number17
DOIs
StatePublished - Oct 26 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Stoutimore, M. J. A., 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. (2018). Second-Harmonic Current-Phase Relation in Josephson Junctions with Ferromagnetic Barriers. Physical review letters, 121(17), [177702]. https://doi.org/10.1103/PhysRevLett.121.177702