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Dc magnetic properties of Mn doped YBa2Cu3O [iopmath latex="$_{7-\delta}$"] 7- [/iopmath] superconductor

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Dc magnetization measurements were carried out on YBa2(Cu [iopmath latex="$_{1-x}$"] 1-x [/iopmath] Mn [iopmath latex="$_x$"] x [/iopmath] )3O [iopmath latex="$_{7-\delta}$"] 7- [/iopmath] samples with x taking values 0, 0.01, 0.015, 0.02, 0.025, 0.035 and 0.05, YBa2(Cu [iopmath latex="$_{0.975}$"] 0.975 [/iopmath] Fe [iopmath latex="$_{0.025}$"] 0.025 [/iopmath] )3O [iopmath latex="$_{7-\delta}$"] 7- [/iopmath] , YBa2(Cu [iopmath latex="$_{0.975}$"] 0.975 [/iopmath] Ni [iopmath latex="$_{0.025}$"] 0.025 [/iopmath] )3O [iopmath latex="$_{7-\delta}$"] 7- [/iopmath] and YBa2(Cu [iopmath latex="$_{0.975}$"] 0.975 [/iopmath] Zn [iopmath latex="$_{0.025}$"] 0.025 [/iopmath] )3O [iopmath latex="$_{7-\delta}$"] 7- [/iopmath] samples up to a maximum field of 5 T at temperatures 5, 50 and 77 K. The effect of Mn on the zero field critical current density, [iopmath latex="$J_{cg}(0)$"] Jcg(0) [/iopmath] , estimated from the remnant magnetization, in general, is a monotonic suppression up to a concentration of 2.5% Mn and shows a saturation beyond that concentration. The field and temperature dependences of 2.5% Mn doped YBa2Cu3O [iopmath latex="$_{7-\delta}$"] 7- [/iopmath] samples were better than those of the Ni, Fe and Zn at the same doping level. Anomalous increases in [iopmath latex="$J_{cg}(0)$"] Jcg(0) [/iopmath] , the indicative lower critical field, [iopmath latex="$H^{*}_{c1g}$"] H*c1g [/iopmath] , and the bulk flux pinning force, [iopmath latex="$F_p$"] Fp [/iopmath] , observed in the 2.0% Mn doped sample, at 50 and 77 K, have been attributed to the matching of the Abrikosov vortex density generated over these temperatures and the defect induced number of pinning sites due to the Mn doping.

Document Type: Miscellaneous

Affiliations: 1: School of Physics, University of Hyderabad, Hyderabad - 500 046, India 2: Tata Institute of Fundamental Research, Mumbai - 400 005, India

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