MENG, Hao; SAMOKHVALOV, A.; BUZDIN, Alexandre I.

doi:10.1103/PhysRevB.99.024503

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MENG, Hao

SAMOKHVALOV, A.
Institute for Physics of Microstructures of the RAS

BUZDIN, Alexandre I.
Centre de physique moléculaire optique et hertzienne [CPMOH]

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2019-01, vol. 99, n° 2

American Physical Society

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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.< Leer menos

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Nonuniform superconductivity and Josephson effect in a conical ferromagnet

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