Rani, Poonam and Pal, Anand and Awana, V. P. S (2014) High field magneto-transport study of YBa2Cu3O7:Ag-x (x=0.00-0.20). Physica C: Superconductivity and its Applications, 497. pp. 19-23. ISSN 0921-4534

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Abstract

We report high field (up to 13 T) magneto transport [rho(T)II] of YBa2Cu3O7 (YBCO):Ag-x (x = 0.0, 0.1 and 0.2) composites. The transport properties are significantly improved by Ag doping on the insulating grain boundaries of YBCO. Pure and Ag diffused YBCO superconducting samples are synthesised through solid state reaction route. Both pure and Ag doped YBCO are superconducting at below 90 K. Though, the T-c (rho = 0) of YBCO: Ag samples under applied field of 13 T is around 65 K, the same is 45 K for pure YBCO under same applied field. The upper critical field [H-c2(0)], being estimated from rho(T) H is around 70 T for pristine sample, and is above 190 T for Ag doped samples. The boarding of the resistive transition under applied magnetic field is comparatively less and nearly single step for Ag doped samples, while the same is clearly two step and relatively much larger for the pristine YBCO. The resistive broadening is explained on the basis of changed inter-granular coupling and thermally activated flux flow (TAFF). The TAFF activation energy (U-0) is found to be linear with applied magnetic field for all the samples, but with nearly an order of magnitude less value for the Ag doped samples. Summarily, it is shown that inclusion of Ag significantly improves the superconducting performance of YBCO: Ag composites, in particular under applied field.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Elsevier.
Uncontrolled Keywords:	YBCO superconductor Magneto-transport Inter and intra-grain couplings Upper critical field
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	12 Oct 2015 10:51
Last Modified:	12 Oct 2015 10:51
URI:	http://npl.csircentral.net/id/eprint/1326

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