Spin-singlet to triplet Cooper pair converter interface
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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.
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 , vol. 4 , 69 . https://doi.org/10.1038/s42005-021-00567-7
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DescriptionThis 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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