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arXiv · 1805.12546

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, non-vanishing 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.

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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. 2018-06-07. Second-harmonic current-phase relation in Josephson junctions with ferromagnetic barriers. https://doi.org/10.1103/physrevlett.121.177702

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