Mudgel, Monika and Awana, V. P. S. and Bhalla, G. L. and Kishan, H. (2009) Substantial increment in critical parameters of MgB2 superconductor by boron site nano-carbon substitution. Physica C: Superconductivity, 470 (1). S646-S647. ISSN 0921-4534

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Abstract

This paper deals with the determination of critical properties of MgB2 along with the impact of carbon substitution on critical parameters. The change in lattice parameters and decrease of transition temperature, Tc confirms the successful substitution by carbon at boron site. The magneto transport measurements up to 140 kOe are carried out to determine upper critical field (Hc2). The upper critical field values, Hc2 are obtained from ρ–T(H) data based upon the criterion of 90% of normal resistivity. The Ginzburg Landau theory (GL equation) is applied to the ρ–T(H) data which accounts for the temperature dependence behavior of Hc2 in the low temperature high field region along with the determination of Hc(0) value. The Hc(0) value of about 300 kOe is obtained for the carbon doped sample while the same is just near to 160 kOe for the pure MgB2 sample.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	13 Jul 2012 12:16
Last Modified:	13 Jul 2012 12:16
URI:	http://npl.csircentral.net/id/eprint/339

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