Komori, S;
Devine-Stoneman, JM;
Ohnishi, K;
Yang, G;
Devizorova, Z;
Mironov, S;
Montiel, X;
... Robinson, JWA; + view all
(2021)
Spin-orbit coupling suppression and singlet-state blocking of spin-triplet Cooper pairs.
Science Advances
, 7
(3)
, Article eabe0128. 10.1126/sciadv.abe0128.
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Abstract
An inhomogeneous magnetic exchange field at a superconductor/ferromagnet interface converts spin-singlet Cooper pairs to a spin-polarized triplet state. Although the decay envelope of triplet pairs within ferromagnetic materials is well studied, little is known about their decay in nonmagnetic metals and superconductors and, in particular, in the presence of spin-orbit coupling (SOC). Here, we investigate devices in which singlet and triplet supercurrents propagate into the s-wave superconductor Nb. In the normal state of Nb, triplet supercurrents decay over a distance of 5 nm, which is an order of magnitude smaller than the decay of spin-singlet pairs due to the SOC. In the superconducting state of Nb, triplet supercurrents are not able to couple with the singlet wave function and are thus blocked by the absence of available equilibrium states in the singlet gap. The results offer insight into the dynamics between s-wave singlet and s-wave triplet states.
| Type: | Article |
|---|---|
| Title: | Spin-orbit coupling suppression and singlet-state blocking of spin-triplet Cooper pairs |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1126/sciadv.abe0128 |
| Publisher version: | https://doi.org/10.1126/sciadv.abe0128 |
| Language: | English |
| Additional information: | This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/ |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10121472 |
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