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General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: application to strongly spin-polarized systems

General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: application to strongly spin-polarized systems

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Prüfsumme: MD5:15ee45bd1f0f0c64514497a02b868008

ESCHRIG, Matthias, Audrey COTTET, Wolfgang BELZIG, Jacob LINDER, 2015. General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: application to strongly spin-polarized systems. In: New Journal of Physics. 17, 083037. eISSN 1367-2630. Available under: doi: 10.1088/1367-2630/17/8/083037

@article{Eschrig2015Gener-33268, title={General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: application to strongly spin-polarized systems}, year={2015}, doi={10.1088/1367-2630/17/8/083037}, volume={17}, journal={New Journal of Physics}, author={Eschrig, Matthias and Cottet, Audrey and Belzig, Wolfgang and Linder, Jacob}, note={Article Number: 083037} }

eng Eschrig, Matthias 2015 Linder, Jacob General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: application to strongly spin-polarized systems Belzig, Wolfgang Cottet, Audrey 2016-03-08T12:16:29Z 2016-03-08T12:16:29Z Cottet, Audrey Eschrig, Matthias Boundary conditions in quasiclassical theory of superconductivity are of crucial importance for describing proximity effects in heterostructures between different materials. Although they have been derived for the ballistic case in full generality, corresponding boundary conditions for the diffusive limit, described by Usadel theory, have been lacking for interfaces involving strongly spin-polarized materials, e.g. half-metallic ferromagnets. Given the current intense research in the emerging field of superconducting spintronics, the formulation of appropriate boundary conditions for the Usadel theory of diffusive superconductors in contact with strongly spin-polarized ferromagnets for arbitrary transmission probability and arbitrary spin-dependent interface scattering phases has been a burning open question. Here we close this gap and derive the full boundary conditions for quasiclassical Green functions in the diffusive limit, valid for any value of spin polarization, transmission probability, and spin-mixing angles (spin-dependent scattering phase shifts). Our formulation allows also for complex spin textures across the interface and for channel off-diagonal scattering (a necessary ingredient when the numbers of channels on the two sides of the interface differ). As an example we derive expressions for the proximity effect in diffusive systems involving half-metallic ferromagnets. In a superconductor/half-metal/superconductor Josephson junction we find ø <sub>0</sub>-junction behavior under certain interface conditions. Belzig, Wolfgang Linder, Jacob

Dateiabrufe seit 08.03.2016 (Informationen über die Zugriffsstatistik)

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