Physical Review B, volume 89, issue 13, publication number 134517

Spin-orbit coupling as a source of long-range triplet proximity effect in superconductor-ferromagnet hybrid structures

Publication typeJournal Article
Publication date2014-04-23
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor3.7
ISSN24699950, 24699969, 10980121, 1550235X
Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Abstract
We investigate the proximity effect in diffusive superconducting hybrid structures with a spin-orbit (SO) coupling. Our study is focused on the singlet-triplet conversion and the generation of long-range superconducting correlations in ferromagnetic elements. We derive the quasiclassical equations for the Green's functions including the SO coupling terms in form of a background SU(2) field. With the help of these equations, we first present a complete analogy between the spin diffusion process in normal metals and the generation of the triplet components of the condensate in a diffusive superconducting structure in the presence of SO coupling. From this analogy it turns out naturally that the SO coupling is an additional source of the long-range triplet component (LRTC) besides the magnetic inhomogeneities studied in the past. We demonstrate an explicit connection between an inhomogeneous exchange field and SO coupling mechanisms for the generation of the LRTC and establish the conditions for the appearance of the LRTC in different geometries. We also consider a S/F bilayer in contact with normal metal with SO coupling and show that the latter can be used as a source for the LRTC. Our work gives a global description of the singlet-triplet conversion in hybrids structures in terms of generic spin-fields and our results are particularly important for the understanding of the physics underlying spintronics devices with superconductor elements.

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Bergeret F. et al. Spin-orbit coupling as a source of long-range triplet proximity effect in superconductor-ferromagnet hybrid structures // Physical Review B. 2014. Vol. 89. No. 13. 134517
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Bergeret F., Tokatly I. Spin-orbit coupling as a source of long-range triplet proximity effect in superconductor-ferromagnet hybrid structures // Physical Review B. 2014. Vol. 89. No. 13. 134517
RIS |
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RIS Copy
TY - JOUR
DO - 10.1103/PhysRevB.89.134517
UR - https://doi.org/10.1103/PhysRevB.89.134517
TI - Spin-orbit coupling as a source of long-range triplet proximity effect in superconductor-ferromagnet hybrid structures
T2 - Physical Review B
AU - Bergeret, F.S.
AU - Tokatly, I.V.
PY - 2014
DA - 2014/04/23
PB - American Physical Society (APS)
IS - 13
VL - 89
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
BibTex
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BibTex Copy
@article{2014_Bergeret,
author = {F.S. Bergeret and I.V. Tokatly},
title = {Spin-orbit coupling as a source of long-range triplet proximity effect in superconductor-ferromagnet hybrid structures},
journal = {Physical Review B},
year = {2014},
volume = {89},
publisher = {American Physical Society (APS)},
month = {apr},
url = {https://doi.org/10.1103/PhysRevB.89.134517},
number = {13},
doi = {10.1103/PhysRevB.89.134517}
}
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