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Fabrication and characterization of YBa2Cu3O7−x/Sn composite superconductors

✍ Scribed by R. Chaim; Y. Ezer

Publisher
Springer
Year
1993
Tongue
English
Weight
286 KB
Volume
28
Category
Article
ISSN
0022-2461

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✦ Synopsis

YBa2CUaOT_x/Sn (YBCO/Sn) composites sintered at 230 ~ exhibited a percolation threshold for electrical conductivity at 20 vol % Sn, with semiconducting and metallic behaviour below and above it, respectively. The simultaneous decrease in r = dp/d T and Po with increase in Sn content was related to formation of defect-free interfaces. The diamagnetic shielding property of the composites weakened with Sn content, as deduced from magnetic levitation experiments.

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It has been shown that Nd 1+x Ba 2-x Cu 3 O 7-x could exhibit a pronounced J c (H) peak effect, which results in an enhancement of the critical current density under the medium range magnetic field. Additions of small quantities of Nd 2 O 3 into Pt-doped YBa 2 Cu 3 O 7-x (Y123) resulted in the forma