Enhanced magnetic flux pinning in nano-composite (re)-ba-cu-o bulk superconductors

D. A. Cardwell; N. Hari Babu; K. Iida

doi:10.1556/NANO.1.2006.2.3

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Nanopages

Volume/Issue:: Volume 1: Issue 2

Enhanced magnetic flux pinning in nano-composite (re)-ba-cu-o bulk superconductors

Authors:

D. A. Cardwell

D. A. Cardwell IRC in Superconductivity, University of Cambridge Madingley Road, Cambridge, CB3 0HE, UK

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N. Hari Babu

N. Hari Babu IRC in Superconductivity, University of Cambridge Madingley Road, Cambridge, CB3 0HE, UK

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K. Iida

K. Iida IRC in Superconductivity, University of Cambridge Madingley Road, Cambridge, CB3 0HE, UK

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Pages:: 165–183

Online Publication Date:: 26 Feb 2007

Publication Date:: 01 Jun 2006

Article Category:: Research Article

DOI:: https://doi.org/10.1556/NANO.1.2006.2.3

Keywords:: nano-composites; nano-scale flux pinning; bulk superconductors

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Nano-composite (RE)-Ba-Cu-O bulk superconductors containing non-superconducting phase inclusions of composition RE ₂ Ba ₄ CuMO _y (the '2411' phase), where M = W, Nb, Ag and Bi, embedded in the REBa ₂ Cu ₃ O _7-_d (RE-123) superconducting matrix have been fabricated successfully. The 2411-phase has typical dimensions in the range 10-300 nm and is stable under the substitution of any rare earth element on the Y site for all M elements. The 2411-phase is paramagnetic in nature and is characterized by a double perovskite cubic crystallographic structure. All phases within the (RE)-2411 family are chemically inert within the RE-123 matrix and do not coarsen appreciably at elevated temperatures during processing. Most significantly, the (RE)-2411 phase forms effective flux pinning sites within the superconducting matrix, since their size is comparable to that of the coherence length of RE-Ba-Cu-O. A direct correlation between the RE ₂ Ba ₄ CuMO _y phase inclusions content in the RE-123 matrix and increased magnetic flux pinning has been observed. The flux pinning force and the current densities increase by an order of magnitude for the nano-composites compared to that of bulk, melt processed RE-Ba-Cu-O without inclusions, confirming their potential for improved current carrying performance when processed in the form of bulk, thin-film or coated conductors.

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Nanopages An Interdisciplinary Journal of Nano Science and Technology

Print ISSN:: 1787-4033

Online ISSN:: 1788-0718

Nanopages
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Nanopages
Language	English
Size	B5
Year of Foundation	2006
Volumes per Year	1
Issues per Year	1
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó
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ISSN	1787-4033 (Print)
ISSN	1788-0718 (Online)