Please use this identifier to cite or link to this item:
http://bura.brunel.ac.uk/handle/2438/1997
Title: | Bulk superconducting nano-composites with high critical currents |
Authors: | Hari Babu, N Iida, K Briffa, A Shi, Y Cardwell, DA |
Keywords: | Flux pinning;High temperature superconductors;Melt-textured superconductors;Nano-composites |
Issue Date: | 2007 |
Publisher: | IEEE |
Citation: | IEEE Trans Applied Superconductivity, 17: 2953 |
Abstract: | Flux pinning sites are most effective if their size is comparable to the superconducting coherence length, which is on the nano-meter scale for RE-Ba-Cu-O superconductors [RE = rare earth element]. Introducing nano-phase inclusions directly into the bulk superconducting material has only been partially successful to date, however, due primarily to the absence of chemically stable phases that can co-exist with RE-Ba-Cu-O without suppressing its key superconducting properties. We have identified novel isostructural phases based on (RE)2Ba4CuMOy (where M = W, Zr, Nb, Ag and Bi) and have fabricated successfully superconducting bulk nano-composites with a high current carrying capability. The average size of the nano-inclusions is observed to vary from 20 nm to 300 nm depending on element M. An observed improvement in Jc under low and high external magnetic fields at 77 K correlates directly with an increased density of nano-inclusions in the superconducting matrix. |
URI: | http://bura.brunel.ac.uk/handle/2438/1997 |
DOI: | http://dx.doi.org/10.1109/TASC.2007.898223 |
ISSN: | 1051-8223 |
Appears in Collections: | Materials Engineering Brunel Centre for Advanced Solidification Technology (BCAST) |
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FullText.pdf | 1.33 MB | Adobe PDF | View/Open |
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