Mudgel, Monika and Awana, V. P. S. and Kishan, H. and Bhalla, G. L. (2008) Significant improvement of flux pinning and irreversibility field in nano-carbon-doped MgB2 superconductor. Solid State Communications, 146 (7-8). pp. 330-334. ISSN 0038-1098

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Abstract

We report the synthesis and variation of superconductivity parameters such as transition temperature T-c, upper critical field He, critical current density J(c), irreversibility field H-irr and flux pinning parameter (F-p) for the MgB2-xCx system with nano-carbon doping up to x = 0.20. Carbon substitutes successfully on boron site and results in significant enhancement of H-irr and J(c)(H). Resistivity measurements reveal a continuous decrease in T-c under zero applied field, while the same improves remarkably at higher fields with an increase in nano-carbon content for MgB2-xCx system. The irreversibility field value (H-irr) is 7.6 and 6.6 T at 5 and 10 K respectively for the pristine sample, which is enhanced to 13.4 and 11.0 T for x = 0.08 sample at same temperatures. Compared to undoped sample, critical current density (J(c)) for the x = 0.08 nano-carbon-doped sample is increased by a factor of 24 at 10 K at 6 T field.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Subjects:	Applied Physics/Condensed Matter Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	06 Apr 2017 08:10
Last Modified:	06 Apr 2017 08:10
URI:	http://npl.csircentral.net/id/eprint/2086

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