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Title: Magnetic signature of granular superconductivity in electrodeposited Pb nanowires

Nanocrystalline freestanding Pb nanowires ∼200 nm in diameter were fabricated by electrodeposition into track etched polycarbonate membranes in order to study their superconducting properties. Their superconducting critical temperature, as determined by measuring the Meissner effect, was the same as for bulk Pb, but their critical field was greatly enhanced up to ∼3000 Oe. By assuming the wires consisted of spherical superconducting grains, an estimated grain size r = 60 ± 25 nm was obtained from the magnetization measured as a function of the applied magnetic field at a fixed temperature. An independent estimate for r = 47 ± 12 nm, in good agreement with the previous one, was obtained from the magnetization measured as a function of temperature at a fixed applied magnetic field. Transmission electron microscopy was used to characterize grain size at the wire edges, where a grain size in agreement with the magnetic studies was observed.
Authors:
 [1] ;  [2] ;  [3]
  1. CNR, Institute for Nanostructured Materials, Via Gobetti 101, 40129 Bologna (Italy)
  2. (United Kingdom)
  3. H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL (United Kingdom)
Publication Date:
OSTI Identifier:
22304137
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CARBONATES; CRITICAL FIELD; CRITICAL TEMPERATURE; CRYSTALS; ELECTRODEPOSITION; GRAIN SIZE; LEAD; MAGNETIZATION; MEMBRANES; NANOWIRES; POLYCARBONATES; QUANTUM WIRES; SPHERICAL CONFIGURATION; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; TRANSMISSION ELECTRON MICROSCOPY