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Proximity-induced superconductivity in crystalline Cu and Co nanowires and nanogranular Co structures

Kompaniiets, M. and Dobrovolskiy, O. V. and Neetzel, Cornelia and Begun, E. and Porrati, F. and Ensinger, Wolfgang and Huth, M. (2014):
Proximity-induced superconductivity in crystalline Cu and Co nanowires and nanogranular Co structures.
116, In: Journal of Applied Physics, (7), pp. 073906. [Article]

Abstract

We report an experimental study of proximity effect-induced superconductivity in crystalline Cu and Co nanowires and a nanogranular Co nanowire structure in contact with a superconducting W-based floating electrode (inducer). For electrical resistance measurements up to three pairs of Pt-based voltage leads were attached at different distances beside the inner inducer electrode, thus allowing us to probe the proximity effect over a length of 2-12 µm. Up to 30% resistance drops with respect to the normal-state value have been observed for the crystalline Co and Cu nanowires when sweeping the temperature below Tc of the inducer (5.2 K). By contrast, relative R(T) drops were found to be an order of magnitude smaller for the nanogranular Co nanowire structure. Our analysis of the resistance data shows that the superconducting proximity length in crystalline Cu and Co is about 1 µm at 2.4 K, attesting to a long-range proximity effect in the Co nanowire. Moreover, this long-range proximity effect is insusceptible to magnetic fields up to 11 T, which is indicative of spin-triplet pairing. At the same time, proximity-induced superconductivity in the nanogranular Co nanowire is strongly suppressed due to the dominating Cooper pair scattering caused by its intrinsic microstructure.

Item Type: Article
Erschienen: 2014
Creators: Kompaniiets, M. and Dobrovolskiy, O. V. and Neetzel, Cornelia and Begun, E. and Porrati, F. and Ensinger, Wolfgang and Huth, M.
Title: Proximity-induced superconductivity in crystalline Cu and Co nanowires and nanogranular Co structures
Language: English
Abstract:

We report an experimental study of proximity effect-induced superconductivity in crystalline Cu and Co nanowires and a nanogranular Co nanowire structure in contact with a superconducting W-based floating electrode (inducer). For electrical resistance measurements up to three pairs of Pt-based voltage leads were attached at different distances beside the inner inducer electrode, thus allowing us to probe the proximity effect over a length of 2-12 µm. Up to 30% resistance drops with respect to the normal-state value have been observed for the crystalline Co and Cu nanowires when sweeping the temperature below Tc of the inducer (5.2 K). By contrast, relative R(T) drops were found to be an order of magnitude smaller for the nanogranular Co nanowire structure. Our analysis of the resistance data shows that the superconducting proximity length in crystalline Cu and Co is about 1 µm at 2.4 K, attesting to a long-range proximity effect in the Co nanowire. Moreover, this long-range proximity effect is insusceptible to magnetic fields up to 11 T, which is indicative of spin-triplet pairing. At the same time, proximity-induced superconductivity in the nanogranular Co nanowire is strongly suppressed due to the dominating Cooper pair scattering caused by its intrinsic microstructure.

Journal or Publication Title: Journal of Applied Physics
Volume: 116
Number: 7
Uncontrolled Keywords: copper, electrical resistivity, electrodes, nanowires, Superconductivity models
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences
Date Deposited: 14 Sep 2014 15:59
Official URL: http://scitation.aip.org/content/aip/journal/jap/116/7/10.10...
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