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Title: Long-range superconducting proximity effect in polycrystalline Co nanowires

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 T{sub c} = 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.

Authors:
; ;  [1]; ; ;  [2]
  1. Physikalisches Institut, Goethe-University, 60438 Frankfurt am Main (Germany)
  2. Department of Materials Science, TU Darmstadt, 64287 Darmstadt (Germany)
Publication Date:
OSTI Identifier:
22283255
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 104; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; COBALT; ELECTRIC CONDUCTIVITY; ELECTRIC POTENTIAL; FERROMAGNETISM; MAGNETIC FIELDS; POLYCRYSTALS; PROXIMITY EFFECT; QUANTUM WIRES; SPIN; TRANSITION TEMPERATURE; TRIPLETS

Citation Formats

Kompaniiets, M., Porrati, F., Huth, M., Dobrovolskiy, O. V., E-mail: Dobrovolskiy@Physik.uni-frankfurt.de, Department of Physics, V. Karazin National University, 61077 Kharkiv, Neetzel, C., Brötz, J., and Ensinger, W. Long-range superconducting proximity effect in polycrystalline Co nanowires. United States: N. p., 2014. Web. doi:10.1063/1.4863980.
Kompaniiets, M., Porrati, F., Huth, M., Dobrovolskiy, O. V., E-mail: Dobrovolskiy@Physik.uni-frankfurt.de, Department of Physics, V. Karazin National University, 61077 Kharkiv, Neetzel, C., Brötz, J., & Ensinger, W. Long-range superconducting proximity effect in polycrystalline Co nanowires. United States. https://doi.org/10.1063/1.4863980
Kompaniiets, M., Porrati, F., Huth, M., Dobrovolskiy, O. V., E-mail: Dobrovolskiy@Physik.uni-frankfurt.de, Department of Physics, V. Karazin National University, 61077 Kharkiv, Neetzel, C., Brötz, J., and Ensinger, W. 2014. "Long-range superconducting proximity effect in polycrystalline Co nanowires". United States. https://doi.org/10.1063/1.4863980.
@article{osti_22283255,
title = {Long-range superconducting proximity effect in polycrystalline Co nanowires},
author = {Kompaniiets, M. and Porrati, F. and Huth, M. and Dobrovolskiy, O. V., E-mail: Dobrovolskiy@Physik.uni-frankfurt.de and Department of Physics, V. Karazin National University, 61077 Kharkiv and Neetzel, C. and Brötz, J. and Ensinger, W.},
abstractNote = {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 T{sub c} = 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.},
doi = {10.1063/1.4863980},
url = {https://www.osti.gov/biblio/22283255}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 5,
volume = 104,
place = {United States},
year = {Mon Feb 03 00:00:00 EST 2014},
month = {Mon Feb 03 00:00:00 EST 2014}
}