Effect of Ca2CuO3 excess on superconducting properties in BiPbSrCaCuO system

doi:10.1016/0921-4534(91)91250-8

Physica C: Superconductivity

Volumes 185–189, Part 4, 1 December 1991, Pages 2251-2252

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Abstract

The effect of excess Ca₂CuO₃ on flux pinning in the (Bi,Pb)₂Sr₂Ca₂Cu₃O_y (2223) was investigated through the measurements of A.C. susceptibility, critical current density and critical field. It was found that when the excess Ca₂CuO₃ is in the range between 0.1 M to 0.3 M the loss peak of A.C. susceptibility appeared at higher temperature than that for undoped sample and the J_c and the Hc₂ showed a maximum, indicating that excess Ca₂CuO₃ enhanced the flux pinning.

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Samples of the Bi-Te-Pb-Sr-Ca-Cu-O system with various nominal compositions were prepared by a free melt-quenching and subsequent annealing procedure. Phase formation, T_c, B_c, B_c2 (0), and irreversibility line were investigated employing direct measurements as well as estimations by AC losses and AC magnetic susceptibility measurements techniques. The intrinsic and coupling critical temperatures systematically increase with prolonged annealing time for samples with nominal composition Bi_1.6Pb_0.3Te_0.1Sr₂Ca₃Cu₄O_y. At the low magnetic field region up to 100 Oe the linear relation (1-T_p/T_c ) vs. H $13$ is fulfilled. Increased upper critical field values up to B_c2(O)=201.4 T were obtained. An optimal annealing time (about 72 h, 835°C, air, sample S4.2) exists at which minimal normal state resistivity as well as enhanced flux pinning (maximal B_c2 (O) values) were reached.
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Effect of Ca2CuO3 excess on superconducting properties in BiPbSrCaCuO system

Abstract

Physica C

Phys. Rev.

Effect of Ca₂CuO₃ excess on superconducting properties in BiPbSrCaCuO system