Physical Review B, volume 76, issue 6, publication number 064514

Density of states and supercurrent in diffusive SNS junctions: Roles of nonideal interfaces and spin-flip scattering

Publication typeJournal Article
Publication date2007-08-14
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor3.7
ISSN24699950, 24699969, 10980121, 1550235X
Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Abstract
We present a theoretical study of the density of states and supercurrent in diffusive superconductor-normal metal-superconductor (SNS) junctions. In particular, we study the influence on these two equilibrium properties of both an arbitrary transparency of the SN interfaces and the presence of spin-flip scattering in the normal wire. We show that the minigap that is present in the spectrum of the diffusive wire is very sensitive to the interface transmission. More importantly, we show that at arbitrary transparency the minigap replaces the Thouless energy as the relevant energy scale for the proximity effect, determining for instance the temperature dependence of the critical current. We also study in detail how the critical current is suppressed by the effect of spin-flip scattering, which can be due to either magnetic impurities or, under certain circumstances, to an external magnetic field. Our analysis based on the quasiclassical theory of diffusive superconductors can be very valuable to establish quantitative comparisons between experiment and theory.

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Hammer J. C. et al. Density of states and supercurrent in diffusive SNS junctions: Roles of nonideal interfaces and spin-flip scattering // Physical Review B. 2007. Vol. 76. No. 6. 064514
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Hammer J. C., Cuevas J. C., Cuevas J., BERGERET F. S., Bergeret F., Belzig W. Density of states and supercurrent in diffusive SNS junctions: Roles of nonideal interfaces and spin-flip scattering // Physical Review B. 2007. Vol. 76. No. 6. 064514
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TY - JOUR
DO - 10.1103/PhysRevB.76.064514
UR - https://doi.org/10.1103/PhysRevB.76.064514
TI - Density of states and supercurrent in diffusive SNS junctions: Roles of nonideal interfaces and spin-flip scattering
T2 - Physical Review B
AU - Hammer, J. C.
AU - Cuevas, J C
AU - BERGERET, F. S.
AU - Belzig, W.
AU - Cuevas, J.
AU - Bergeret, F.S.
PY - 2007
DA - 2007/08/14
PB - American Physical Society (APS)
IS - 6
VL - 76
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
BibTex
Cite this
BibTex Copy
@article{2007_Hammer,
author = {J. C. Hammer and J C Cuevas and F. S. BERGERET and W. Belzig and J. Cuevas and F.S. Bergeret},
title = {Density of states and supercurrent in diffusive SNS junctions: Roles of nonideal interfaces and spin-flip scattering},
journal = {Physical Review B},
year = {2007},
volume = {76},
publisher = {American Physical Society (APS)},
month = {aug},
url = {https://doi.org/10.1103/PhysRevB.76.064514},
number = {6},
doi = {10.1103/PhysRevB.76.064514}
}
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