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We report high field (up to 13 Tesla) magneto transport R(T)H] of YBa2Cu3O7(YBCO):Agx (x= 0.0, 0.1 and 0.2) composites. The transport properties aresignificantly improved by Ag doping on the insulating grain boundaries of YBCO.Pure and Ag diffused YBCO superconducting samples are synthesized through solidstate reaction route. Both pure and Ag doped YBCO are superconducting at below90K. Though, the Tc (R=0) of YBCO:Ag samples under applied field of 13 Tesla isaround 65K, the same is 45K for pure YBCO under same applied field. The uppercritical field [Hc2(0)], being estimated from R(T)H is around 70Tesla forpristine sample, and is above 190Tesla for Ag doped samples. The boarding ofthe resistive transition under applied magnetic field is comparatively less andnearly single step for Ag doped samples, while the same is clearly two step andrelatively much larger for the pristine YBCO. The resistive broadening isexplained on the basis of changed inter-granular coupling and thermallyactivated flux flow (TAFF). The TAFF activation energy (U0) is found to belinear with applied magnetic field for all the samples, but with nearly anorder of magnitude less value for the Ag doped samples. Summarily, it is shownthat inclusion of Ag significantly improves the superconducting performance ofYBCO:Ag composites, in particular under applied field.

High field magneto-transport study of YBa2Cu3O7-Agx (x = 0.0 to 0.20)