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

Machiel Geert Flokstra; T.C. Cunningham; J. Kim; Nathan Satchell; Gavin Burnell; Peter J. Curran; Simon J. Bending; Christy Kinane; Joshaniel F.K. Cooper; Sean Langridge; Aldo Isidori; Nataliya Pugach; Matthias Eschrig; Stephen L. Lee

doi:10.1103/PhysRevB.91.060501

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

Machiel Geert Flokstra, T.C. Cunningham, J. Kim, Nathan Satchell, Gavin Burnell, Peter J. Curran, Simon J. Bending, Christy Kinane, Joshaniel F.K. Cooper, Sean Langridge, Aldo Isidori, Nataliya Pugach, Matthias Eschrig, Stephen L. Lee

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Abstract

Transport measurements are presented on thin-film superconducting spin-valve systems, where the controlled non-collinear 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 anti-parallel 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(R)
Pages (from-to)	1-5
Number of pages	5
Journal	Physical Review B
Volume	91
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.91.060501
Publication status	Published - 2 Feb 2015

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Final ManuscriptFinal published version, 479 KB
Supplementary MaterialFinal published version, 1.89 MB

Generation, Imaging and Control of Novel Coherent Electronic States in Artificial Ferromagnetic-Superconducting Hybrid Metamaterials and Devices
Eschrig, M. (PI)
Eng & Phys Sci Res Council EPSRC
1/03/12 → 31/08/16
Project: Research

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Flokstra, M. G., Cunningham, T. C., Kim, J., Satchell, N., Burnell, G., Curran, P. J., Bending, S. J., Kinane, C., 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, 91(6), 1-5. Article 060501(R). https://doi.org/10.1103/PhysRevB.91.060501

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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 non-collinear 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 anti-parallel 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.",

author = "Flokstra, {Machiel Geert} and T.C. Cunningham and J. Kim and Nathan Satchell and Gavin Burnell and Curran, {Peter J.} and Bending, {Simon J.} and Christy Kinane and Cooper, {Joshaniel F.K.} and Sean Langridge and Aldo Isidori and Nataliya Pugach and Matthias Eschrig and Lee, {Stephen L.}",

year = "2015",

month = feb,

day = "2",

doi = "10.1103/PhysRevB.91.060501",

language = "English",

volume = "91",

pages = "1--5",

journal = "Physical Review B",

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, C, 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, vol. 91, no. 6, 060501(R), pp. 1-5. https://doi.org/10.1103/PhysRevB.91.060501

TY - JOUR

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

AU - Flokstra, Machiel Geert

AU - Cunningham, T.C.

AU - Kim, J.

AU - Satchell, Nathan

AU - Burnell, Gavin

AU - Curran, Peter J.

AU - Bending, Simon J.

AU - Kinane, Christy

AU - Cooper, Joshaniel F.K.

AU - Langridge, Sean

AU - Isidori, Aldo

AU - Pugach, Nataliya

AU - Eschrig, Matthias

AU - Lee, Stephen L.

PY - 2015/2/2

Y1 - 2015/2/2

N2 - Transport measurements are presented on thin-film superconducting spin-valve systems, where the controlled non-collinear 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 anti-parallel 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 non-collinear 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 anti-parallel 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.

U2 - 10.1103/PhysRevB.91.060501

DO - 10.1103/PhysRevB.91.060501

M3 - Letter

SN - 1098-0121

VL - 91

SP - 1

EP - 5

JO - Physical Review B

JF - Physical Review B

IS - 6

M1 - 060501(R)

ER -

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

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

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