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Superconductivity at 52.5 K in the lanthanum-barium-copper-oxide systemThe electrical properties of the (La/0/9/Ba/0.1/)CuO/4-y/ system are examined under ambient and hydrostatic pressures. The resistance, ac magnetic susceptibility, and superconductivity onset, midpoint, and intercept temperatures are measured. It is observed that at ambient pressure the resistance decreases with temperature decreases, and the ac susceptibility shows diamagnetic shifts starting at about 32 K. Under hydrostatic pressure a superconducting transition with an onset temperature of 52.5 K is observed, and the resistance increases at lower temperatures. The data reveal that the electrical properties of the La-Ba-Cu-O system are dependent on samples and preparation conditions. Various causes for the high temperature superconductivity of the system are proposed.
Document ID
19870043598
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chu, C. W.
(Houston, University TX; NSF, Div. of Materials Research, Washington, DC, United States)
Hor, P. H.
(Houston Univ. TX, United States)
Meng, R. L.
(Houston Univ. TX, United States)
Gao, L.
(Houston Univ. TX, United States)
Huang, Z. J.
(Houston, University TX, United States)
Date Acquired
August 13, 2013
Publication Date
January 30, 1987
Publication Information
Publication: Science
Volume: 235
ISSN: 0036-8075
Subject Category
Solid-State Physics
Accession Number
87A30872
Funding Number(s)
CONTRACT_GRANT: NSF DMR-82-04173
CONTRACT_GRANT: NAGW-977
Distribution Limits
Public
Copyright
Other

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