Critical currents and vortex pinning in 235U doped Ag/Bi2223 tapes

Babić, Emil and Kušević, Ivica and Marinaro, Damien and Dou, Shi Xue (2001) Critical currents and vortex pinning in 235U doped Ag/Bi2223 tapes. Fizika A, 10 (4). pp. 155-168. ISSN 1330-0008

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Abstract

Systematic analysis of the transport critical current densities J_c at 77 K for ^235U-oxide (UO_2·2H_2O) doped Ag-sheathed (Bi,Pb)_2Sr_2Ca_2Cu_3O_x tapes (Bi2223) irradiated with thermal neutrons is presented. Within the explored range of U-oxide concentrations (c £ 2 wt%) and neutron fluences (ϕ £ 6·10_19 n/m^2), the pinning of vortices in irradiated tapes increases approximately linearly with fission track density (proportional to cϕ), as evidenced by progressively weaker magnetic field dependence of Jc on increasing cf. Accordingly, the crossover field B* at which the pinning force density F_p reaches its maximum value F_pmax = J_cB* and the irreversibility field B_irr(F_p -> 0) increase approximately linearly with cϕ. Therefore, J_c-B and F_p-B variations for all tapes with vortex pinning dominated by fission tracks show universal scaling behaviour with the scaling parameter B* (proportional to cϕ). Taking into account the adverse effects of c and f on Jc of our tapes, we estimate a maximum B* and B_irr that can be reached in ^235U-oxide doped Bi2223 tapes at 77 K.

Item Type: Article
Keywords: critical current densities at 77 K, pinning of vortices, crossover field, irreversibility field, universal scaling behaviour
Date: 2001
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 15 Apr 2014 16:24
Last Modified: 15 Apr 2014 16:24
URI: http://digre.pmf.unizg.hr/id/eprint/841

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