@article{d5fc30c722f2433eaa6468a57f31bb66,
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.}",
note = "Funding Information: The authors thank N. S. Stepakov and V. N. Shilov for assistance in sample fabrication and measurements. M. J. A. S and D. J. V. H are supported by Grants No. NSF DMR-1710437 and No. NSF DMR-1610114. S. M. F. is supported by Grants No. NSF PIRE-1743717, No. NSF DMR-1252962, No. NSF DMR-1743972, and ONR. V. V. B. and A. N. R. are supported by Russian Foundation for Basic Research Grant No. 17-02-01270. V. V. R. is supported by the Ministry for Education and Science of Russian Federation under Contract No. K2-2014-025. N. P. gratefully acknowledges support from the TZ-93 Basic Research Program of the National Research University Higher School of Economics. ",
year = "2018",
month = oct,
day = "26",
doi = "10.1103/PhysRevLett.121.177702",
language = "English (US)",
volume = "121",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "17",
}