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Here we present the magnetic properties and upper critical field (BC2) ofpolycrystalline Y(Ba1-xSrx)2Cu3O7-{\delta} superconductors, which are beingdetermined through detailed ac/dc susceptibility and resistivity under magneticfield (RTH) study. All the samples are synthesized through solid state reactionroute. Reduction in Meissner fraction (the ratio of field cooled to zero fieldcooled magnetization) is observed with increasing Sr content, suggestingoccurrence of flux pining in the doped samples. The ac susceptibility andresistivity measurements reveal improved grain couplings in Sr substitutedsamples. Consequently the inter-grain critical current density (Jc), upturncurvature near the Tc in temperature dependence of upper critical field[BC2(T)], and BC2 are enhanced. Both Jc and BC2 increase in lower Srsubstitution (up to x = 0.10) samples followed by decrease in higher doping dueto degradation in effective pining and grain coupling.

Magnetization and Magneto-resistance in Y(Ba1-xSrx)2Cu3O7-{\delta} (x = 0.00 - 0.50) superconductor