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

Published online by Cambridge University Press:  31 January 2011

H.K. Liu ,
S.X. Dou ,
S.J. Guo ,
K.E. Easterling  and
X.G. Li
H.K. Liu
Affiliation:
School of Materials Science and Engineering, University of New South Wales, Kensington, New South Wales 2033, Australia
S.X. Dou
Affiliation:
School of Materials Science and Engineering, University of New South Wales, Kensington, New South Wales 2033, Australia
S.J. Guo
Affiliation:
Department of Engineering Materials, Luleå University of Technology, S-95187, Luleå, Sweden
K.E. Easterling
Affiliation:
School of Engineering, University of Exeter, Exeter, Devon, EX4 4QF, United Kingdom
X.G. Li
Affiliation:
Centre for Structural Measurements, Chinese University of Science and Technology, Hefei, People's Republic of China
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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.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 11 , November 1991 , pp. 2287 - 2290
Copyright
Copyright © Materials Research Society 1991

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