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Enhanced spin pumping into superconductors provides evidence for superconducting pure spin currents

Jeon, K-R; Ciccarelli, C; Ferguson, AJ; Kurebayashi, H; Cohen, LF; Montiel, X; Eschrig, M; ... Blamire, MG; + view all (2018) Enhanced spin pumping into superconductors provides evidence for superconducting pure spin currents. Nature Materials , 17 (6) pp. 499-503. 10.1038/s41563-018-0058-9. Green open access

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Abstract

Unlike conventional spin-singlet Cooper pairs, spin-triplet pairs can carry spin. Triplet supercurrents were discovered in Josephson junctions with metallic ferromagnet spacers, where spin transport can occur only within the ferromagnet and in conjunction with a charge current. Ferromagnetic resonance injects a pure spin current from a precessing ferromagnet into adjacent non-magnetic materials. For spin-singlet pairing, the ferromagnetic resonance spin pumping efficiency decreases below the critical temperature (Tc) of a coupled superconductor. Here we present ferromagnetic resonance experiments in which spin sink layers with strong spin–orbit coupling are added to the superconductor. Our results show that the induced 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.

Type: Article
Title: Enhanced spin pumping into superconductors provides evidence for superconducting pure spin currents
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41563-018-0058-9
Publisher version: http://dx.doi.org/10.1038/s41563-018-0058-9
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
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: http://discovery.ucl.ac.uk/id/eprint/10050380
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