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Study of some superconducting and magnetic materials on high T sub c oxide superconductorsOn the basis of existing data it appears that the high-temperature superconductivity above 77 K reported here, occurs only in compound systems consisting of a phase other than the K2NiF4 phase. A narrow superconducting transition was obtained with T sub c0 = 98 K and T sub c1 = 94 K in Y-Ba-Cu-O (YBCO). Preliminary results indicate that YBCO is rather different from the layered LaBCO, LaSCO, and LaCCO. While electron-photon interaction cannot be absent from this compound system, nonconventional enhanced superconducting interactions due to interfaces, Resonating Valence Bond (RVB) states, or even a superconducting state beyond the BCS framework, may be required to account for the high T sub c in YBCO. It is believed that study of the possible subtle correlation between magnetism and superconductivity will definitely provide important insight into the superconducting mechanism in YBCO and other oxides.
Document ID
19880005431
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Wu, M. K.
(Alabama Univ. Huntsville, AL, United States)
Date Acquired
September 5, 2013
Publication Date
October 1, 1987
Subject Category
Solid-State Physics
Report/Patent Number
NAS 1.26:182330
NASA-CR-182330
Accession Number
88N14813
Funding Number(s)
CONTRACT_GRANT: NAG8-032
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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