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High-temperature resistance behavior of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub y/ and YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ superconductors

Journal Article · · Appl. Phys. Lett.; (United States)
DOI:https://doi.org/10.1063/1.100498· OSTI ID:7015956
High- and low-temperature resistance measurements have been carried out on Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub y/ and YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ in air and in vacuum. Both the ceramics exhibit a significant change in oxygen content during annealing between 350 and 450 /sup 0/C. The Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub y/ sample exhibits an increase in resistance with increased oxygen content resulting in deterioration of superconductivity, whereas YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ shows improvement in superconducting behavior with increase in oxygen content. Consequently Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+//sub y/ prepared by fast cooling from the sintering temperature possesses a higher T/sub c/ , whereas slow cooling of YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ produces a higher T/sub c/ .
Research Organization:
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, United Kingdom
OSTI ID:
7015956
Journal Information:
Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 53:21; ISSN APPLA
Country of Publication:
United States
Language:
English

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