Commercial alumina templates as base to fabricate 123-type high-Tc superconductor nanowires

Michael Rudolf Koblischka, X. L. Zeng, U. Hartmann

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Nanowires of high-Tc superconductors of the RE-123 type (RE = rare earths) were grown by the anodized alumina template method, employing commercially available alumina templates with nominal pore diameters of 20 and 100 nm. Pre-reacted YBa2Cu3Ox (YBCO) and NdBa2Cu3Ox (NdBCO) powder was molten on top of the templates in order to fill the pores with the 123-type material. The resulting samples were oxygen-annealed at 450 °C. Superconductivity with a transition temperature of 88 K (YBCO) and 96 K (NdBCO) was confirmed by means of magnetic susceptibility measurements (SQUID) using pieces of the filled template. The electric (resistance) and magnetic measurements revealed further relatively sharp superconducting transitions. To understand the dimensions of the resulting nanowires (length up to 10 μm, diameter between 100 and 250 nm), which do not correspond to the nominal pore diameters, the empty and filled commercial templates were analyzed in detail by scanning electron microscopy. We discuss the feasibility of this approach to produce larger amounts of nanowires.

Original languageEnglish
Pages (from-to)1069-1076
Number of pages8
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume213
Issue number4
DOIs
Publication statusPublished - 2016 Apr 1
Externally publishedYes

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Keywords

  • alumina templates
  • fabrication
  • high-T superconductors
  • nanowires

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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