Enhanced spin pumping into superconductors provides evidence for superconducting pure spin currents
File(s)
Supporting information
Accepted version
Author(s)
Type
Journal Article
Abstract
Unlike conventional spin-singlet Cooper pairs, spin-triplet pairs can carry spin.1,2 Triplet supercurrents were discovered in Josephson junctions with metallic ferromagnet (FM) spacers, where spin transport can only occur within the FM and in conjunction with a charge current. Ferromagnetic resonance (FMR) injects a pure spin current from a precessing FM into adjacent non-magnetic materials.
3,4 For spin-singlet pairing, FMR spin pumping efficiency decreases below the critical temperature (Tc) of a coupled superconductor (SC).
5,6
Here we present FMR experiments in which spin sink layers with strong spin-orbit coupling are added to the SC. Our results show that the indu
ced spin currents, rather than being suppressed, are substantially larger in
the superconducting state compared with the normal state; although further work is
required to establish the details of the spin transport process we show that this cannot be mediated by quasiparticles and is most likely a triplet pure spin supercurrent.
3,4 For spin-singlet pairing, FMR spin pumping efficiency decreases below the critical temperature (Tc) of a coupled superconductor (SC).
5,6
Here we present FMR experiments in which spin sink layers with strong spin-orbit coupling are added to the SC. Our results show that the indu
ced spin currents, rather than being suppressed, are substantially larger in
the superconducting state compared with the normal state; although further work is
required to establish the details of the spin transport process we show that this cannot be mediated by quasiparticles and is most likely a triplet pure spin supercurrent.
Date Issued
2018-04-16
Date Acceptance
2018-02-22
Citation
Nature Materials, 2018, 17, pp.499-503
ISSN
1476-1122
Publisher
Nature Publishing Group
Start Page
499
End Page
503
Journal / Book Title
Nature Materials
Volume
17
Copyright Statement
© 2018 Springer Nature Limited. All rights reserved.
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Materials Science
Physics
FERROMAGNET
INTERFACES
MD Multidisciplinary
Nanoscience & Nanotechnology
Publication Status
Published