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Nonuniform superconductivity and Josephson effect in a conical ferromagnet
| dc.contributor.author | MENG, Hao | |
| hal.structure.identifier | Institute for Physics of Microstructures of the RAS | |
| dc.contributor.author | SAMOKHVALOV, A. | |
| hal.structure.identifier | Centre de physique moléculaire optique et hertzienne [CPMOH] | |
| dc.contributor.author | BUZDIN, Alexandre I. | |
| dc.date.issued | 2019-01 | |
| dc.identifier.issn | 1098-0121 | |
| dc.description.abstractEn | Using 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.iso | en | |
| dc.publisher | American Physical Society | |
| dc.title.en | Nonuniform superconductivity and Josephson effect in a conical ferromagnet | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1103/PhysRevB.99.024503 | |
| dc.subject.hal | Physique [physics] | |
| dc.subject.hal | Physique [physics]/Matière Condensée [cond-mat] | |
| dc.subject.hal | Physique [physics]/Matière Condensée [cond-mat]/Supraconductivité [cond-mat.supr-con] | |
| bordeaux.journal | Physical Review B: Condensed Matter and Materials Physics (1998-2015) | |
| bordeaux.volume | 99 | |
| bordeaux.issue | 2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-02140469 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-02140469v1 | |
| bordeaux.COinS | ctx_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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