Spin-singlet to triplet Cooper pair converter interface

Matthew Rogers; Alistair Walton; Machiel G. Flokstra; Fatma Al Ma’Mari; Rhea Stewart; Stephen L. Lee; Thomas Prokscha; Andrew J. Caruana; Christian J. Kinane; Sean Langridge; Harry Bradshaw; Timothy Moorsom; Mannan Ali; Gavin Burnell; Bryan J. Hickey; Oscar Cespedes

doi:10.1038/s42005-021-00567-7

Spin-singlet to triplet Cooper pair converter interface

Matthew Rogers^*, Alistair Walton, Machiel G. Flokstra, Fatma Al Ma’Mari, Rhea Stewart, Stephen L. Lee, Thomas Prokscha, Andrew J. Caruana, Christian J. Kinane, Sean Langridge, Harry Bradshaw, Timothy Moorsom, Mannan Ali, Gavin Burnell, Bryan J. Hickey, Oscar Cespedes^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Combining magnetic and superconducting functionalities enables lower energy spin transfer and magnetic switching in quantum computing and information storage, owing to the dissipationless nature of quasi-particle mediated supercurrents. Here, we put forward a system where emergent spin-ordering and diffusion of Cooper pairs are achieved at a non-intrinsically magnetic nor superconducting metallo-molecular interface. Electron transport, magnetometry and low-energy muon spin rotation are used to probe time-reversal symmetry breaking in these structures. By comparing the Meissner expulsion in a system including a Cu/C60 spin-converter interface to one without, we observe a paramagnetic contribution that can be explained due to the conversion of spin-singlet Cooper pair states into odd-frequency triplet states. These results demonstrate the potential of metallo-molecular interfaces to achieve singlet to triplet Cooper pair conversion, a capability not present in either metal or molecule separately that could be used in the generation and controlled diffusion of spin polarised dissipationless currents.

Original language	English
Article number	69
Number of pages	9
Journal	Communications Physics
Volume	4
Early online date	8 Apr 2021
DOIs	https://doi.org/10.1038/s42005-021-00567-7
Publication status	E-pub ahead of print - 8 Apr 2021

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Data on spin-singlet to triplet Cooper pair converter interface
Rogers, M. (Creator), Walton, A. (Creator), Flokstra, M. G. (Creator), Ma’Mari, F. A. (Creator), Stewart, R. (Creator), Lee, S. (Creator), Prokscha, T. (Creator), Caruana, A. J. (Creator), Kinane, C. J. (Creator), Langridge, S. (Creator), Bradshaw, H. (Creator), Moorsom, T. (Creator), Ali, M. (Creator), Burnell, G. (Creator), Hickey, B. J. (Creator), Cespedes, O. (Creator) & Al Ma'Mari, F. (Contributor), University of Leeds, 7 Feb 2021
DOI: 10.5518/852, https://doi.org/10.5286/ISIS.E.RB1820617
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Rogers, M., Walton, A., Flokstra, M. G., Al Ma’Mari, F., Stewart, R., Lee, S. L., Prokscha, T., Caruana, A. J., Kinane, C. J., Langridge, S., Bradshaw, H., Moorsom, T., Ali, M., Burnell, G., Hickey, B. J., & Cespedes, O. (2021). Spin-singlet to triplet Cooper pair converter interface. Communications Physics, 4, Article 69. Advance online publication. https://doi.org/10.1038/s42005-021-00567-7

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title = "Spin-singlet to triplet Cooper pair converter interface",

abstract = "Combining magnetic and superconducting functionalities enables lower energy spin transfer and magnetic switching in quantum computing and information storage, owing to the dissipationless nature of quasi-particle mediated supercurrents. Here, we put forward a system where emergent spin-ordering and diffusion of Cooper pairs are achieved at a non-intrinsically magnetic nor superconducting metallo-molecular interface. Electron transport, magnetometry and low-energy muon spin rotation are used to probe time-reversal symmetry breaking in these structures. By comparing the Meissner expulsion in a system including a Cu/C60 spin-converter interface to one without, we observe a paramagnetic contribution that can be explained due to the conversion of spin-singlet Cooper pair states into odd-frequency triplet states. These results demonstrate the potential of metallo-molecular interfaces to achieve singlet to triplet Cooper pair conversion, a capability not present in either metal or molecule separately that could be used in the generation and controlled diffusion of spin polarised dissipationless currents.",

author = "Matthew Rogers and Alistair Walton and Flokstra, {Machiel G.} and {Al Ma{\textquoteright}Mari}, Fatma and Rhea Stewart and Lee, {Stephen L.} and Thomas Prokscha and Caruana, {Andrew J.} and Kinane, {Christian J.} and Sean Langridge and Harry Bradshaw and Timothy Moorsom and Mannan Ali and Gavin Burnell and Hickey, {Bryan J.} and Oscar Cespedes",

note = "This work was supported by EPSRC grant nos. EP/S030263/1, EP/M000923/1 and EP/K00512X/1. Experiments performed at the ISIS Pulsed Neutron and Muon Source were supported by a beamtime allocation from the Science and Technology Facilities Council experiment number RB 1820617. PSI LEM beamtime access via proposal IDs 20161840, 20171184 and 20190352. ",

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AU - Rogers, Matthew

AU - Walton, Alistair

AU - Flokstra, Machiel G.

AU - Al Ma’Mari, Fatma

AU - Stewart, Rhea

AU - Lee, Stephen L.

AU - Prokscha, Thomas

AU - Caruana, Andrew J.

AU - Kinane, Christian J.

AU - Langridge, Sean

AU - Bradshaw, Harry

AU - Moorsom, Timothy

AU - Ali, Mannan

AU - Burnell, Gavin

AU - Hickey, Bryan J.

AU - Cespedes, Oscar

N1 - This work was supported by EPSRC grant nos. EP/S030263/1, EP/M000923/1 and EP/K00512X/1. Experiments performed at the ISIS Pulsed Neutron and Muon Source were supported by a beamtime allocation from the Science and Technology Facilities Council experiment number RB 1820617. PSI LEM beamtime access via proposal IDs 20161840, 20171184 and 20190352.

PY - 2021/4/8

Y1 - 2021/4/8

N2 - Combining magnetic and superconducting functionalities enables lower energy spin transfer and magnetic switching in quantum computing and information storage, owing to the dissipationless nature of quasi-particle mediated supercurrents. Here, we put forward a system where emergent spin-ordering and diffusion of Cooper pairs are achieved at a non-intrinsically magnetic nor superconducting metallo-molecular interface. Electron transport, magnetometry and low-energy muon spin rotation are used to probe time-reversal symmetry breaking in these structures. By comparing the Meissner expulsion in a system including a Cu/C60 spin-converter interface to one without, we observe a paramagnetic contribution that can be explained due to the conversion of spin-singlet Cooper pair states into odd-frequency triplet states. These results demonstrate the potential of metallo-molecular interfaces to achieve singlet to triplet Cooper pair conversion, a capability not present in either metal or molecule separately that could be used in the generation and controlled diffusion of spin polarised dissipationless currents.

AB - Combining magnetic and superconducting functionalities enables lower energy spin transfer and magnetic switching in quantum computing and information storage, owing to the dissipationless nature of quasi-particle mediated supercurrents. Here, we put forward a system where emergent spin-ordering and diffusion of Cooper pairs are achieved at a non-intrinsically magnetic nor superconducting metallo-molecular interface. Electron transport, magnetometry and low-energy muon spin rotation are used to probe time-reversal symmetry breaking in these structures. By comparing the Meissner expulsion in a system including a Cu/C60 spin-converter interface to one without, we observe a paramagnetic contribution that can be explained due to the conversion of spin-singlet Cooper pair states into odd-frequency triplet states. These results demonstrate the potential of metallo-molecular interfaces to achieve singlet to triplet Cooper pair conversion, a capability not present in either metal or molecule separately that could be used in the generation and controlled diffusion of spin polarised dissipationless currents.

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DO - 10.1038/s42005-021-00567-7

M3 - Article

SN - 2399-3650

VL - 4

JO - Communications Physics

JF - Communications Physics

M1 - 69

ER -

Spin-singlet to triplet Cooper pair converter interface

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Data on spin-singlet to triplet Cooper pair converter interface

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