Superconducting characteristics of (Bi, Pb)-2223 single crystals with controlled oxygen-content

Critical current density was measured for oxygen-controlled (Bi, Pb)-2223 single crystals before and after the irradiation with gold ions in a magnetic field parallel to the irradiation-induced defects along the c-axis. Eleven specimens prepared in different annealing conditions were measured. The c...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2009-10, Vol.469 (15), p.1224-1228
Main Authors: Kawai, S., Otabe, E.S., Kiuchi, M., Matsushita, T., Nomura, T., Yamauchi, H., Motohashi, T., Okayasu, S.
Format: Article
Language:English
Subjects:
Bi-2223 single crystal
Columnar defect
Condensation energy density
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical current density
Critical currents
Exact sciences and technology
Irreversibility field
Physics
Properties of type I and type II superconductors
Superconductivity
Vortex lattices ,flux pinning, flux creep
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Summary:Critical current density was measured for oxygen-controlled (Bi, Pb)-2223 single crystals before and after the irradiation with gold ions in a magnetic field parallel to the irradiation-induced defects along the c-axis. Eleven specimens prepared in different annealing conditions were measured. The condensation energy density of each specimen was evaluated from the observed critical current density by using the summation theory of pinning forces of columnar defects and the flux creep theory. It was found that the specimen heat-treated at 1 atm in oxygen atmosphere has the highest condensation energy density among all specimens. Hence, it is speculated that the optimum oxygen pressure for the anneal is around 1 atm.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2009.05.108