Triplet Cooper pairs induced in diffusive s-wave superconductors interfaced with strongly spin-polarized magnetic insulators or half-metallic ferromagnets

Scientific Reports
Jabir Ali OuassouJ Linder

Abstract

Interfacing superconductors with strongly spin-polarized magnetic materials opens the possibility to discover new spintronic devices in which spin-triplet Cooper pairs play a key role. Motivated by the recent derivation of spin-polarized quasiclassical boundary conditions capable of describing such a scenario in the diffusive limit, we consider the emergent physics in hybrid structures comprised of a conventional s-wave superconductor (e.g. Nb, Al) and either strongly spin-polarized ferromagnetic insulators (e.g. EuO, GdN) or halfmetallic ferromagnets (e.g. CrO2, LCMO). In contrast to most previous works, we focus on how the superconductor itself is influenced by the proximity effect, and how the generated triplet Cooper pairs manifest themselves in the self-consistently computed density of states (DOS) and the superconducting critical temperature T c . We provide a comprehensive treatment of how the superconductor and its properties are affected by the triplet pairs, demonstrating that our theory can reproduce the recent observation of an unusually large zero-energy peak in a superconductor interfaced with a half-metal, which even exceeds the normal-state DOS. We also discuss the recent observation of a large superconducting s...Continue Reading

References

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Sep 24, 2015·Reports on Progress in Physics·Matthias Eschrig
Oct 28, 2015·Scientific Reports·Jacob Linder, Jason W A Robinson

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Citations

Jul 7, 2018·Beilstein Journal of Nanotechnology·Andrey A KamashevIlgiz A Garifullin
Dec 12, 2018·Nature Communications·S DieschE Scheer
Jan 5, 2019·Physical Review Letters·Akashdeep KamraWolfgang Belzig

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