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Rietveld refinement of YBa{sub 2}Cu{sub 3-x}Ni{sub x}O{sub y} prepared by quenching and oxygen gettering

Description: We have refined the structures for YBa{sub 2}Cu{sub 2.94}Ni{sub 0.06}O{sub y} (2% Ni) and YBa{sub 2}Cu{sub 2.80}Ni{sub 0.20}O{sub y} (6.67% Ni) at y {approximately} 6.95 and y {approximately} 6.5 contents. Oxygen was reduced by two independent methods: quenching from 690{degrees}C and oxygen gettering at 450{degrees}C. Cu-0 bond lengths were calculated based on Rietveld structure refinements for the various samples; they indicate the likely occupancy of Ni in the plane (Cu2) site of the 123 superconductor.
Date: October 1, 1995
Creator: Rodriguez, M.; Eatough, M. & Licci, F.
Partner: UNT Libraries Government Documents Department

{open_quotes}Fishtails{close_quotes} in 123-superconductors

Description: Several high quality (RE)Ba{sub 2}Cu{sub 3}O{sub 7-x} single crystals with RE = Y, Yb and Dy, with varying amounts of Au- and Al-impurities have been investigated by SQUID magnetometry. All samples show fishtail behavior. Differences in the sample preparation only influence the position of the maximum in J{sub c}. The authors conclude that the fishtail phenomenon is not a material specific property, but a generally occurring property of the flux line lattice.
Date: August 1, 1994
Creator: Werner, M.; Sauerzopf, F. M.; Weber, H. W.; Veal, B. W.; Licci, F.; Winzer, K. et al.
Partner: UNT Libraries Government Documents Department