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

doi:10.1103/PhysRevLett.121.177702

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

Physics

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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 language	English (US)
Article number	177702
Journal	Physical review letters
Volume	121
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.121.177702
State	Published - Oct 26 2018

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General Physics and Astronomy

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10.1103/PhysRevLett.121.177702

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title = "Second-Harmonic Current-Phase Relation in Josephson Junctions with Ferromagnetic Barriers",

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.",

author = "Stoutimore, {M. J.A.} and Rossolenko, {A. N.} and Bolginov, {V. V.} and Oboznov, {V. A.} and Rusanov, {A. Y.} and Baranov, {D. S.} and N. Pugach and Frolov, {S. M.} and Ryazanov, {V. V.} and {Van Harlingen}, {D. J.}",

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doi = "10.1103/PhysRevLett.121.177702",

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AU - Stoutimore, M. J.A.

AU - Rossolenko, A. N.

AU - Bolginov, V. V.

AU - Oboznov, V. A.

AU - Rusanov, A. Y.

AU - Baranov, D. S.

AU - Pugach, N.

AU - Frolov, S. M.

AU - Ryazanov, V. V.

AU - Van Harlingen, D. J.

PY - 2018/10/26

Y1 - 2018/10/26

N2 - 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.

AB - 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.

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

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