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- Title
Commercial alumina templates as base to fabricate 123-type high- T<sub>c</sub> superconductor nanowires.
- Authors
Koblischka, M. R.; Zeng, X. L.; Hartmann, U.
- 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.
- Subjects
ALUMINUM oxide; NANOCONTACTS; NANOWIRE devices; NANOWIRE optical sensors; QUANTUM electronics; NANOWIRES
- Publication
Physica Status Solidi. A: Applications & Materials Science, 2016, Vol 213, Issue 4, p1069
- ISSN
1862-6300
- Publication type
Article
- DOI
10.1002/pssa.201532475