Physical Review B, volume 92, issue 2, publication number 024510
Critical temperature and tunneling spectroscopy of superconductor-ferromagnet hybrids with intrinsic Rashba-Dresselhaus spin-orbit coupling
Publication type: Journal Article
Publication date: 2015-07-24
Journal:
Physical Review B
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 3.7
ISSN: 24699950, 24699969, 10980121, 1550235X
Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Abstract
We investigate theoretically how the proximity effect in superconductor/ferromagnet hybrid structures with intrinsic spin-orbit coupling manifests in two measurable quantities, namely, the density of states and critical temperature. To describe a general scenario, we allow for both Rashba- and Dresselhaus-type spin-orbit coupling. Our results are obtained via the quasiclassical theory of superconductivity, extended to include spin-orbit coupling in the Usadel equation and in the Kupriyanov-Lukichev boundary conditions. Unlike previous works, we have derived a Riccati parametrization of the Usadel equation with spin-orbit coupling which allows us to address the full proximity regime and not only the linearized weak proximity regime. First, we consider the density of states in both SF bilayers and SFS trilayers, where the spectroscopic features in the latter case are sensitive to the phase difference between the two superconductors. We find that the presence of spin-orbit coupling leaves clear spectroscopic fingerprints in the density of states due to its role in creating spin-triplet Cooper pairs. Unlike SF and SFS structures without spin-orbit coupling, the density of states in the present case depends strongly on the direction of magnetization. Moreover, we show that the spin-orbit coupling can stabilize spin-singlet superconductivity even in the presence of a strong exchange field $h\ensuremath{\gg}\mathrm{\ensuremath{\Delta}}$. This leads to the possibility of a magnetically tunable minigap: changing the direction of the exchange field opens and closes the minigap. We also determine how the critical temperature ${T}_{c}$ of an SF bilayer is affected by spin-orbit coupling and, interestingly, demonstrate that one can achieve a spin-valve effect with a single ferromagnet. We find that ${T}_{c}$ displays highly nonmonotonic behavior both as a function of the magnetization direction as well as the type and direction of the spin-orbit coupling, offering a new way to exert control over the superconductivity of proximity structures.
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Jacobsen S. H., Ouassou J. A., Linder J. Critical temperature and tunneling spectroscopy of superconductor-ferromagnet hybrids with intrinsic Rashba-Dresselhaus spin-orbit coupling // Physical Review B. 2015. Vol. 92. No. 2. 024510
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Jacobsen S. H., Ouassou J. A., Linder J. Critical temperature and tunneling spectroscopy of superconductor-ferromagnet hybrids with intrinsic Rashba-Dresselhaus spin-orbit coupling // Physical Review B. 2015. Vol. 92. No. 2. 024510
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TY - JOUR
DO - 10.1103/PhysRevB.92.024510
UR - https://doi.org/10.1103/PhysRevB.92.024510
TI - Critical temperature and tunneling spectroscopy of superconductor-ferromagnet hybrids with intrinsic Rashba-Dresselhaus spin-orbit coupling
T2 - Physical Review B
AU - Jacobsen, Sol H.
AU - Ouassou, Jabir Ali
AU - Linder, Jacob
PY - 2015
DA - 2015/07/24
PB - American Physical Society (APS)
IS - 2
VL - 92
SN - 2469-9950
SN - 2469-9969
SN - 1098-0121
SN - 1550-235X
ER -
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@article{2015_Jacobsen,
author = {Sol H. Jacobsen and Jabir Ali Ouassou and Jacob Linder},
title = {Critical temperature and tunneling spectroscopy of superconductor-ferromagnet hybrids with intrinsic Rashba-Dresselhaus spin-orbit coupling},
journal = {Physical Review B},
year = {2015},
volume = {92},
publisher = {American Physical Society (APS)},
month = {jul},
url = {https://doi.org/10.1103/PhysRevB.92.024510},
number = {2},
doi = {10.1103/PhysRevB.92.024510}
}