Controlled suppression of superconductivity by the generation of polarized Cooper pairs in spin-valve structures
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Transport measurements are presented on thin-film superconducting spin-valve systems, where the controlled noncollinear arrangement of two ferromagnetic Co layers can be used to influence the superconducting state of Nb. We observe a very clear oscillation of the superconducting transition temperature with the relative orientation of the two ferromagnetic layers. Our measurements allow us to distinguish between the competing influences of domain averaging, stray dipolar fields, and the formation of superconducting spin triplets. Domain averaging is shown to lead to a weak enhancement of transition temperature for the antiparallel configuration of exchange fields, while much larger changes are observed for other configurations, which can be attributed to drainage currents due to spin triplet formation.
Flokstra , M G , Cunningham , T C , Kim , J , Satchell , N , Burnell , G , Curran , P J , Bending , S J , Kinane , C J , Cooper , J F K , Langridge , S , Isidori , A , Pugach , N , Eschrig , M & Lee , S L 2015 , ' Controlled suppression of superconductivity by the generation of polarized Cooper pairs in spin-valve structures ' Physical Review. B, Condensed matter and materials physics , vol 91 , no. 6 , 060501 . DOI: 10.1103/PhysRevB.91.060501
Physical Review. B, Condensed matter and materials physics
© 2015 American Physical Society. Reproduced in accordance with APS Transfer of Copyright terms and conditions.
DescriptionThe authors acknowledge the support of the EPSRC through Grants No. EP/J01060X, No. EP/J010626/1, No. EP/J010650/1, No. EP/J010634/1, and No. EP/J010618/1, support of a studentship supported by JEOL Europe and the ISIS Neutron and Muon Source, and the support of the RFBR via Awards No. 13-02-01452-a, and No. 14-02-90018 BEL-a.
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