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New Journal of Physics, volume 17, issue 8, pages 83037

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

Publication typeJournal Article
Publication date2015-08-18
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor3.3
ISSN13672630
General Physics and Astronomy
Abstract
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, such as 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). It 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 $\phi_0$ junction behavior under certain interface conditions.

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GOST Copy
Eschrig M. et al. General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: Application to strongly spin-polarized systems // New Journal of Physics. 2015. Vol. 17. No. 8. p. 83037.
GOST all authors (up to 50) Copy
Eschrig M., Cottet A., Belzig W., Linder J. General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: Application to strongly spin-polarized systems // New Journal of Physics. 2015. Vol. 17. No. 8. p. 83037.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1088/1367-2630/17/8/083037
UR - https://doi.org/10.1088/1367-2630/17/8/083037
TI - General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: Application to strongly spin-polarized systems
T2 - New Journal of Physics
AU - Eschrig, M.
AU - Cottet, A.
AU - Belzig, W.
AU - Linder, Jacob
PY - 2015
DA - 2015/08/18
PB - IOP Publishing
SP - 83037
IS - 8
VL - 17
SN - 1367-2630
ER -
BibTex |
Cite this
BibTex Copy
@article{2015_Eschrig,
author = {M. Eschrig and A. Cottet and W. Belzig and Jacob Linder},
title = {General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: Application to strongly spin-polarized systems},
journal = {New Journal of Physics},
year = {2015},
volume = {17},
publisher = {IOP Publishing},
month = {aug},
url = {https://doi.org/10.1088/1367-2630/17/8/083037},
number = {8},
pages = {83037},
doi = {10.1088/1367-2630/17/8/083037}
}
MLA
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MLA Copy
Eschrig, M., et al. “General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: Application to strongly spin-polarized systems.” New Journal of Physics, vol. 17, no. 8, Aug. 2015, p. 83037. https://doi.org/10.1088/1367-2630/17/8/083037.
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