Controlled suppression of superconductivity by the generation of polarized Cooper pairs in spin-valve structures

M. G. Flokstra; T. C. Cunningham; J. Kim; N. Satchell; G. Burnell; P. J. Curran; S. J. Bending; C. J. Kinane; J. F. K. Cooper; S. Langridge; A. Isidori; N. Pugach; M. Eschrig; S. L. Lee

doi:10.1103/PhysRevB.91.060501

Controlled suppression of superconductivity by the generation of polarized Cooper pairs in spin-valve structures

M. G. Flokstra^*, T. C. Cunningham, J. Kim, N. Satchell, G. Burnell, P. J. Curran, S. J. Bending, C. J. Kinane, J. F. K. Cooper, S. Langridge, A. Isidori, N. Pugach, M. Eschrig, S. L. Lee

^*Corresponding author for this work

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Abstract

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.

Original language	English
Article number	060501
Number of pages	5
Journal	Physical Review. B, Condensed matter and materials physics
Volume	91
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.91.060501
Publication status	Published - 2 Feb 2015

Keywords

Triplet supercurrents
Ferromagnet
Proximity
Multilayers

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10.1103/PhysRevB.91.060501

Lee_2015_PRB_Controlled
© 2015 American Physical Society. Reproduced in accordance with APS Transfer of Copyright terms and conditions.
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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, 91(6), Article 060501. https://doi.org/10.1103/PhysRevB.91.060501

@article{80a48b4ad2c54f7c9dd69b90b22101d5,

title = "Controlled suppression of superconductivity by the generation of polarized Cooper pairs in spin-valve structures",

abstract = "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.",

keywords = "Triplet supercurrents, Ferromagnet, Proximity, Multilayers",

author = "Flokstra, {M. G.} and Cunningham, {T. C.} and J. Kim and N. Satchell and G. Burnell and Curran, {P. J.} and Bending, {S. J.} and Kinane, {C. J.} and Cooper, {J. F. K.} and S. Langridge and A. Isidori and N. Pugach and M. Eschrig and Lee, {S. L.}",

note = "The 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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doi = "10.1103/PhysRevB.91.060501",

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issn = "1098-0121",

publisher = "American Physical Society",

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Flokstra, MG, Cunningham, TC, Kim, J, Satchell, N, Burnell, G, Curran, PJ, Bending, SJ, Kinane, CJ, Cooper, JFK, Langridge, S, Isidori, A, Pugach, N, Eschrig, M & Lee, SL 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. https://doi.org/10.1103/PhysRevB.91.060501

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T1 - Controlled suppression of superconductivity by the generation of polarized Cooper pairs in spin-valve structures

AU - Flokstra, M. G.

AU - Cunningham, T. C.

AU - Kim, J.

AU - Satchell, N.

AU - Burnell, G.

AU - Curran, P. J.

AU - Bending, S. J.

AU - Kinane, C. J.

AU - Cooper, J. F. K.

AU - Langridge, S.

AU - Isidori, A.

AU - Pugach, N.

AU - Eschrig, M.

AU - Lee, S. L.

N1 - The 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.

PY - 2015/2/2

Y1 - 2015/2/2

N2 - 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.

AB - 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.

KW - Triplet supercurrents

KW - Ferromagnet

KW - Proximity

KW - Multilayers

UR - http://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.060501#supplemental

U2 - 10.1103/PhysRevB.91.060501

DO - 10.1103/PhysRevB.91.060501

M3 - Article

SN - 1098-0121

VL - 91

JO - Physical Review. B, Condensed matter and materials physics

JF - Physical Review. B, Condensed matter and materials physics

IS - 6

M1 - 060501

ER -

Controlled suppression of superconductivity by the generation of polarized Cooper pairs in spin-valve structures

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Generation: Generation Imaging and Control of Novel Coherent Electronic States in Artificial Ferromagnetic-Superconducting Hybrid Metamaterials and Devices

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Controlled suppression of superconductivity by the generation of polarized Cooper pairs in spin-valve structures

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Generation: Generation Imaging and Control of Novel Coherent Electronic States in Artificial Ferromagnetic-Superconducting Hybrid Metamaterials and Devices

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