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Long-range superconducting proximity effect in polycrystalline Co nanowires

Kompaniiets, M. and Dobrovolskiy, O. V. and Neetzel, C. and Porrati, F. and Brötz, J. and Ensinger, Wolfgang and Huth, M. (2014):
Long-range superconducting proximity effect in polycrystalline Co nanowires.
104, In: Applied Physics Letters, (5), pp. 052603. AIP Publishing LLC, ISSN 1077-3118,
[Article]

Abstract

We report experimental evidence of a long-range superconducting proximity effect in polycrystalline Co nanowires in contact with a superconducting W-based floating electrode (inducer). For electrical resistance measurements, voltage leads were connected to the Co nanowire on both sides of the superconducting inducer at a distance of 7.2 µm. We observed a 28% reduction of the nanowire resistance when sweeping the temperature below the inducer's transition temperature Tc = 5.2 K. Our analysis of the resistance data shows that the superconducting proximity length in polycrystalline Co is as large as 1 µm at 2.4 K, attesting to a long-range proximity effect. Moreover, this long-range proximity effect is insusceptible to magnetic fields up to 11 T, which is indicative of spin-triplet pairing. Our results provide evidence that magnetic inhomogeneity of the ferromagnet enlarges the spatial extend of the spin-triplet superconducting proximity effect.

Item Type: Article
Erschienen: 2014
Creators: Kompaniiets, M. and Dobrovolskiy, O. V. and Neetzel, C. and Porrati, F. and Brötz, J. and Ensinger, Wolfgang and Huth, M.
Title: Long-range superconducting proximity effect in polycrystalline Co nanowires
Language: English
Abstract:

We report experimental evidence of a long-range superconducting proximity effect in polycrystalline Co nanowires in contact with a superconducting W-based floating electrode (inducer). For electrical resistance measurements, voltage leads were connected to the Co nanowire on both sides of the superconducting inducer at a distance of 7.2 µm. We observed a 28% reduction of the nanowire resistance when sweeping the temperature below the inducer's transition temperature Tc = 5.2 K. Our analysis of the resistance data shows that the superconducting proximity length in polycrystalline Co is as large as 1 µm at 2.4 K, attesting to a long-range proximity effect. Moreover, this long-range proximity effect is insusceptible to magnetic fields up to 11 T, which is indicative of spin-triplet pairing. Our results provide evidence that magnetic inhomogeneity of the ferromagnet enlarges the spatial extend of the spin-triplet superconducting proximity effect.

Journal or Publication Title: Applied Physics Letters
Volume: 104
Number: 5
Publisher: AIP Publishing LLC
Uncontrolled Keywords: electrical resistivity, Ferromagnetism, Lead, Magnetic fields, nanowires, Polycrystals, scanning electron microscopy, Superconducting proximity effects, Superconductivity, Superconductors
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 Feb 2014 15:17
Official URL: http://scitation.aip.org/content/aip/journal/apl/104/5/10.10...
Funders: This work was supported by the Beilstein Institut, Frankfurt/M, within the research collaboration NanoBiC.
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