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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.
ISSN: 1051-8223
Appears in Collections:Materials Engineering
Brunel Centre for Advanced Solidification Technology (BCAST)

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