ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Meissner effect measurements were used to characterize the effect of copper depletion and silver substitution on the bulk superconducting properties of YBa2Cu3Oy. A strong copper composition dependence of superconductivity was observed: A 20% depletion of copper from the samples resulted in an 88% decrease in the strength of superconductivity in YBa2Cu3Oy as measured by the Meissner effect. Because flux trapping and field penetration were likely to be significant in the high-Tc materials, it was difficult to determine the volume fraction of superconducting material in the samples. Variations in the lattice constants were consistent with copper composition-induced disorder on the orthorhombic lattice which became more pseudocubic, i.e., a(approximately-equal-to)b=c/3, with copper depletion. The addition of silver had essentially no effect on superconductivity or the lattice constants of YBa2Cu3Oy.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.348035
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