2006
DOI: 10.1103/physrevb.73.054507
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Spin and charge Josephson effects between nonuniform superconductors with coexisting helimagnetic order

Abstract: We consider the spin and charge Josephson current between two non-uniform Fulde-Ferrel-LarkinOvchinnikov superconductors with helimagnetic order. We demonstrate that the presence of the helimagnetic phase generates a spin Josephson effect and leads to additional contributions to both single-particle and Josephson charge current. It is shown that for such systems the AC effect differs more radically from the DC effect than in the case of a BCS superconductor with helimagnetic order considered earlier in the lit… Show more

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Cited by 28 publications
(26 citation statements)
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“…This has been noted by several authors in the context of superconductors coexisting with helimagnetic or spiral magnetic order 56,57 as well as ferromagnetic superconductors 54,55 . However, the spin-polarization of the Josephson current has not been studied in the arguably simplest case of a single ferromagnetic layer with inhomogeneous magnetization contacted by two conventional s-wave superconductors.…”
Section: Introductionmentioning
confidence: 54%
“…This has been noted by several authors in the context of superconductors coexisting with helimagnetic or spiral magnetic order 56,57 as well as ferromagnetic superconductors 54,55 . However, the spin-polarization of the Josephson current has not been studied in the arguably simplest case of a single ferromagnetic layer with inhomogeneous magnetization contacted by two conventional s-wave superconductors.…”
Section: Introductionmentioning
confidence: 54%
“…(4) is a persistent spin-Josephson current even if the magnetizations on each side of the junction are of equal magnitude and collinear (# 0). This is quite different from the Josephson-like spin current recently considered in ferromagnetic metal junctions [27,28]. There, a twist in the magnetization across the junction is required to drive the spin-Josephson effect.…”
mentioning
confidence: 69%
“…Also, we use bulk uniform magnetic order parameters, as in Refs. [27,28]. The latter is justified on the grounds that a ferromagnet with a planar order parameter is mathematically isomorphic to an s-wave superconductor, where the use of bulk values for the order parameter right up to the interface is a good approximation due to the lack of midgap surface states.…”
mentioning
confidence: 99%
“…The idea is to combine the useful properties of superconductors with spin generation and manipulation. [9][10][11][12][13] Most known superconductors have a spin-singlet symmetry, which means that the Cooper pair does not carry any net spin. For such superconductors, one relies mostly on strong magnetic sources such as half-metallic ferromagnets in concomitance with superconductors for obtaining strongly spin-polarized currents.…”
Section: Introductionmentioning
confidence: 99%