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Nonuniform superconductivity and Josephson effect in a conical ferromagnet

dc.contributor.authorMENG, Hao
hal.structure.identifierInstitute for Physics of Microstructures of the RAS
dc.contributor.authorSAMOKHVALOV, A.
hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
dc.contributor.authorBUZDIN, Alexandre I.
dc.date.issued2019-01
dc.identifier.issn1098-0121
dc.description.abstractEnUsing the Gorkov equations, we provide an exact solution for a one-dimensional model of superconductivity in the presence of a conical helicoidal exchange field. Due to the special type of symmetry of the system, the superconducting transition always occurs into a nonuniform superconducting phase (in contrast with the Fulde-Ferrell-Larkin-Ovchinnikov state, which appears only at low temperatures). We directly demonstrate that the uniform superconducting state in our model carries a current and thus does not correspond to the ground state. We study in the framework of the Bogoliubov-de Gennes approach the properties of the Josephson junction with a conical ferromagnet as a weak link. In our numerical calculations, we do not use any approximations (such as, e.g., a quasiclassical approach), and we show a realization of an anomalous φ 0 junction (with a spontaneous phase difference φ 0 in the ground state). The spontaneous phase difference φ 0 strongly increases at high values of the exchange field near the borderline with a half-metal, and it exists also in the half-metal regime.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.title.enNonuniform superconductivity and Josephson effect in a conical ferromagnet
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevB.99.024503
dc.subject.halPhysique [physics]
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Supraconductivité [cond-mat.supr-con]
bordeaux.journalPhysical Review B: Condensed Matter and Materials Physics (1998-2015)
bordeaux.volume99
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-02140469
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02140469v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20B:%20Condensed%20Matter%20and%20Materials%20Physics%20(1998-2015)&rft.date=2019-01&rft.volume=99&rft.issue=2&rft.eissn=1098-0121&rft.issn=1098-0121&rft.au=MENG,%20Hao&SAMOKHVALOV,%20A.&BUZDIN,%20Alexandre%20I.&rft.genre=article


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