Abstract
The effect of excess Ca2CuO3 on the superconducting properties in the (Bi, Pb)2Sr2Ca2Cu3Oy, (2223) was investigated through the measurements of ac susceptibility, critical current density, and critical field. All the measurements have been performed on the samples that were identified by x-ray diffraction to consist of the mostly high Tc 2223 phase with varying amounts of excess Ca2CuO3. It was found that when the excess Ca2CuO3 is in the range 0.1 M to 0.3 M the loss peak of ac susceptibility appeared at higher temperature than that for an undoped sample, and the Jc showed a maximum at the excess Ca2CuO3 = 0.2 M, indicating that a proper amount of excess Ca2CuO3 enhanced the flux pinning. The upper critical field, Hc2, determined by using a pulse magnetic field showed a maximum at the excess Ca2CuO3 = 0.1 M, and increased linearly with decreasing temperature within the measurement regime.
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Liu, H.K., Dou, S.X., Guo, S.J. et al. Effect of Ca2CuO3 excess on superconducting properties in the Bi–Pb–Sr–Ca–Cu–O system. Journal of Materials Research 6, 2287–2290 (1991). https://doi.org/10.1557/JMR.1991.2287
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DOI: https://doi.org/10.1557/JMR.1991.2287